Newsletter – 17th
March 2024
Hear Professor Probert speak about bigamy FREE
Did Professor Sprout get it right?
Save on Ancestry DNA ENDS
MONDAY/WEDNESDAY
Masterclass: How to
make the most of your DNA test UPDATED
Save on Hiding the Past ENDS MONDAY
The LostCousins
newsletter is usually published 2 or 3 times a month. To access the previous issue
(dated 4th March) click here; to find earlier articles use the customised Google search between
this paragraph and the next (it searches ALL of the newsletters since February
2009, so you don't need to keep copies):
To go to the main
LostCousins website click the logo at the top of this newsletter. If you're not
already a member, do join - it's FREE, and you'll get an email to alert you
whenever there's a new edition of this newsletter available!
Hear Professor Probert speak about bigamy FREE
Between
6pm and 7.30pm (London time) on Monday 25th March Professor Rebecca Probert will
be speaking about Bigamy in Nineteenth-century Nottinghamshire and
Lancashire at the History of Law and Governance Centre at the University of
Nottingham – and you are invited to attend online.
The
talk will explore the changing legal framework governing bigamy in
nineteenth-century England and Wales. Taking Nottinghamshire and Lancashire as
case studies, it will analyse the characteristics of those prosecuted for
bigamy and what this can tell us about the incidence of, and attitudes towards,
bigamy.
To
find out more please follow this link
to the History of Law and Governance Centre website.
Confusingly the link on their site described as Registration URL doesn't take you to a
registration page - it is, in fact, the link for joining the Microsoft Teams meeting
next Monday! I expect that, like me, you're more familiar with Zoom, but Teams isn't
that different. I understand from Professor Probert that the talk will be recorded, and
hopefully I will be able to publish a link in a future newsletter.
Did Professor Sprout get it right?
Miriam
Margolyes is best known to readers of this newsletter for her prestigious role as
a Vice-President of the Society of Genealogists, but during her long career she
has also done a bit of acting, including playing the part of Professor Pomona
Sprout in the Harry Potter film series.
As
an avid reader of the Harry Potter books when I was in my early 50s I was a
little surprised to read that in Ms
Margolyes’s opinion the stories are purely for youngsters. In fact, the only
reason I stopped reading Harry Potter was because the last three books in the
series came out after LostCousins started in 2004 – so I simply couldn’t find
the time (it didn’t help that each was longer than the one before).
What
do you think?
Born on an aeroplane
You
may well have noticed the recent news story about the baby born on flight from
Jordan to London Luton Airport – if not you can read about this unusual
delivery here.
Apparently the child is only the 75th baby
to have been born on a commercial flight – and what you might not know is that all
births and deaths on British-registered planes have been recorded since 1947,
and are in a separate index maintained by the General Register Office (GRO).
There is even a separate index for births on
British-registered hovercraft since 1972 – that must surely be a very short
list!
This
page
on the GOV.UK site lists all of the different indexes.
Save
on Ancestry DNA ENDS SOON
Ancestry
charge a little more for their tests but in my
experience they’re ten times more useful than tests purchased from other
companies – see the Masterclass below for a longer explanation.
The
good news is that until Wednesday 20th March you can save 25% on DNA
tests from Ancestry.co.uk – please use the link below so that you can support
LostCousins when you make your purchase (if it doesn’t seem to work at first,
log-out from Ancestry then click the link again)..
You can
also make big savings in Australia and New Zealand - but the offer ends today (Monday 18th) so you'll
have to be very, very quick.
Masterclass: How to make the most of your DNA
test UPDATED
Note: I've updated this Masterclass significantly
since it was last published in July 2023
Introduction to DNA – why to test, who to
test, and which test to choose
We
all have 'brick walls' in our trees – perhaps because an ancestor was
illegitimate or changed their name. Or maybe we are looking in the wrong
geographical area – people migrated further and more often than most people
expect. And then there are problems with records: they might be missing,
deficient, or even wrong. Fortunately, because our DNA is inherited from our
ancestors it's also a record of our ancestry – one that can not only overcome
gaps and deficiencies in the archives but also provide us with a way of
checking that our research is correct.
Note:
DNA doesn't replace conventional research, it provides a second layer of links
between members of the same family. It's a bit like overlaying a map onto a
satellite image – they are different ways of looking at the same thing. In most
cases each will corroborate the other, which provides us with reassurance that
we are following the right line – but it’s when they tell different
stories that we really appreciate the fact that DNA doesn’t lie.
You
probably don’t have samples of your ancestors' DNA to compare yours against –
though it's technically possible to extract DNA from hair or the gum on the
back of a used postage stamp, it's not a service that mainstream companies
offer. Nor are you likely to get permission to exhume your ancestors’ remains. But
there are lots of other people who do have samples for comparison – your
cousins, both the cousins you know and the cousins you have yet to find. They
inherited their DNA from their ancestors, and whilst most of their ancestors
will be different from yours, any segments of DNA that you share were almost
certainly inherited from your common ancestor(s).
Tip:
anyone who shares some of your ancestors is a cousin of yours, no matter how
distant the relationship; in fact, distant cousins are particularly useful when
it comes to knocking down 'brick walls', though closer cousins can also play a
part.
We
can’t all be DNA experts – and the good news is that provided you follow the
advice in this Masterclass, you'll be able to get amazing results even if you
don’t understand the first thing about the science behind DNA. Indeed there are plenty of people who do know quite a lot
about DNA who would probably achieve more if only they stuck to the simple
strategies in this Masterclass!
Here's
all you really need to know:
·
Most
of the DNA tests on offer to family historians, and the only ones you should be
seriously considering, are autosomal DNA tests; they can taken by both males and females, and they have the
potential to solve puzzles anywhere in your family tree within the last 6 or 7
generations (around 250 years). Sometimes they can reach back even further.
·
All of your DNA comes from your ancestors,
but you inherit only half of your parents' autosomal DNA, they only inherited
half of their parents' DNA, and so on. So always test the earliest generation –
for example, if your parents are deceased, but they have siblings still living,
ask your aunts and uncles to test. They also inherited 50% of your grandparents’
DNA, just not the same 50% as your parents.
·
Once
you go back beyond your parents the amount of DNA you inherit from each
ancestor varies. It is very unlikely that you inherited precisely 25% from each
of your grandparents, and the further you go back the more the percentages
fluctuate around the mean. Go back far enough – say 10 generations – and there
will be some ancestors from whom you have inherited no DNA whatsoever.
·
Unlike
personal traits and some hereditary diseases, DNA doesn’t skip a generation –
you can't possibly inherit a segment of DNA from a grandparent unless your
parent also inherited it and passed it on to you.
·
Just
because you and your cousins share ancestors this doesn't necessarily mean that
you'll share DNA - you could have inherited different bits of DNA from the
ancestors you share; the closer the cousin, the more DNA you're likely to
share, but despite this distant cousins are often more
useful. This is partly because there are so many more of them, but also because
a match you share with a distant cousin can be traced to a smaller section of
your tree. By contrast, when you share a match with a 1st cousin all this tells
you is which side of your tree the match is on.
Which test should you
choose?
Don’t
make your decision based on price; although all of the
main DNA tests on offer are technically similar, what you're looking for is to
get as many matches with genetic cousins as possible, and to make as much sense
of those matches as you can. Ancestry win on both
counts: not only do they have by far the biggest database, with around 25
million users, they integrate their vast collection of family trees with DNA so
much more effectively than other sites that there is far less work for you to
do.
IMPORTANT:
the ONLY way to get access to that enormous database is to buy the Ancestry
test; you can transfer Ancestry DNA results to other sites, but you CANNOT go
the other way.
Ancestry
DNA tests are a little more expensive than the tests on offer at other sites,
but they are well worth the extra: you’ll get more matches, knock down many
more ‘brick walls’ and – if you are already an Ancestry subscriber, or are
prepared to purchase the AncestryDNA Plus membership (Ł14.99 for 6
months in the UK, a little more in other countries) – Ancestry will do a lot of
the basic work for you, saving you hours and hours of effort and making
discoveries you couldn’t possibly make on your own.
The rewards and
challenges of DNA
The
reason I tested my own DNA, and persuaded some of my cousins to join in, was to
knock down 'brick walls' that conventional research couldn't breach. The sad
reality is that if our 'brick walls' have resisted our efforts for years (or
even decades), it’s unlikely that they're ever going to come crashing down if
all we have to go on are the historical records that
have survived.
DNA
can help by bridging gaps in the records and compensating for errors, but it
means adopting new and unfamiliar strategies, and utilising somewhat different
techniques to the ones that we're used to. Fortunately, if you follow the steps
in this Masterclass, rather than struggling to find your own way, or following
the well-meant (but often unhelpful) advice of genetic genealogy gurus, you’ll
get the best results for the least effort.
What to do while you’re waiting for your
results – the importance of documented cousins
DNA
isn't a substitute for researching the records – you need both. So make sure that you do all the conventional,
records-based, research you reasonably can while you’re waiting for your
DNA results, so that when they come through you're ready to go. Don’t leave it
until the last moment, because in my experience the results invariably arrive
well ahead of schedule, typically 4 weeks or less rather than the 6-8 weeks
that Ancestry quote.
There
are two types of cousins
Genetic
cousins
are the cousins you find by testing your DNA. When your results come through you’ll have many thousands of matches – it’s rare to
have fewer than 10,000 and some people have more than 20,000. You won't recognise
more than a handful, and most will have surnames that don’t appear in your
ancestral tree – so you won’t know what the connection is! And that's where documented
cousins come in – they're the cousins you can fit onto your family tree
because you know precisely how they're related to you. Documented cousins are
the ones already in your family tree, as well the cousins you find using
documentary evidence, including the ‘lost cousins’ you find by completing your My
Ancestors page.
The
most valuable cousins are both genetic and documented, and there are several
ways to come up with them:
You
can't do the first two until you get your DNA results through, and it might be
hard to persuade your cousins to test if you're still waiting for your own
results, even if you offer to pay. But the fourth option is open to you right
now, because there is a great source of documented cousins who have already
tested – amongst the LostCousins membership!
Connect
with documented cousins
Complete
your My Ancestors page at the
LostCousins site, ensuring that you have entered ALL of
the cousins that you can find on the 1881 Census. Because your living cousins
are descended from the branches of your tree it's the relatives from the
branches who are most likely to connect you to them. For example:
3rd,
4th, and 5th cousins are ideal when you’re working with DNA. If you’re younger
than me and your grandparents weren't born until after 1881 you could look at
it this way:
Completing
your My Ancestors page might take you an hour or two, but it's easy to
do and could save you money – if you don't find some 'lost cousins' who
have already tested you're likely to end up persuading known cousins to test,
and unless they’re as keen on family history as you are, you’re likely
to be the one who pays for the test.
But
it’s not just about money – connecting with documented cousins who have already
tested could save you hundreds of hours you might otherwise spend
fruitlessly analysing your DNA matches. DNA is like a jigsaw puzzle – the more
pieces you can fit in place the easier it is to figure out how everything else
fits in. DNA matches with documented cousins are the edge pieces of the jigsaw.
Tip: a good way to
maximise the number of relatives you can enter from the 1881 Census, and
thereby maximise the number of ‘lost cousins’ that you find, is to start with
all the relatives you can identify in 1841, whether or not you can actually
find them on that census, then trace each of your branches (sometimes referred
to as collateral lines) through to 1881. Remember that ALL of
your living cousins are descended from the branches of your tree, so every
branch and every twig is a potential link to a 'lost cousin'.
On
my own My Cousins page there are 17 cousins who have already tested
(indicated by 'Y' in the DNA column), and 2 who are considering it (shown by an
'M'). If there is no entry in the column it's worth checking with your cousin
in case they forgot to update their My Details
page when they tested. And make sure you do the same!
Tip:
DNA status isn't shown for relatives who may only be related by marriage, or
for New Contacts; it is only shown for cousins who you have connected with (so
it’s a good reason to connect with cousins you already know).
How your cousins can best help
Shared
matches are the key – if you and a documented cousin match the same genetic
cousin then it’s overwhelmingly likely that the genetic cousin is descended
from one of the ancestral lines that you and your documented cousin share. When
you view a DNA match with any cousin at Ancestry you can click Shared
Matches to find out which other cousins you both match.
Note:
Ancestry only show shared matches where both matches exceed 20cM.
If
your cousins also tested with Ancestry, ask if they would be prepared to make
you a Viewer of their DNA results – this enables you to see ALL of their matches, whether they share them with you or
not, and allows you to check for shared matches where the 20cM threshold has
not been reached.
Note:
as a Viewer or Collaborator you can see another user's matches and their
ethnicity results, but you don’t have access to their raw DNA results. As a
Collaborator you can make notes against the other matches and allocate them to
groups; as a Viewer you can’t.
Being
able to see ALL of a documented cousin's matches
enables you to benefit from the matches they've made with genetic cousins who
share your ancestors but who don’t appear in your own list. Remember what I
said earlier: just because you and a cousin share ancestors doesn’t mean that
you'll share DNA. For example, the chance of two 5th cousins sharing detectable
DNA is about 1 in 3, so most of your unknown 5th cousins won't appear in your
list of matches even if they have tested – but they might be matches for some
of the cousins you already know. This means that the more documented cousins
you collaborate with, the greater your chances of knocking down your 'brick
walls' using DNA matches – collaboration gives you access to a larger pool of
clues.
Uploading a tree and attaching it to your DNA
results
It’s
crucially important to attach a tree to your DNA results, even if you decide to
keep it private – otherwise the Common Ancestors and ThruLines
features that make Ancestry DNA so simple can’t possibly work. If you have
split your tree into separate parts – for example, I have separate trees for
each of my parents – you’ll need to merge them together (most family tree
programs will do this for you). Similarly, if you can and your partner have a
single tree you’ll need to split it into two, to avoid
confusing your DNA matches.
The
tree I’ve attached to my own DNA results includes only my direct ancestors –
this allows me to make it public without any risk of infringing the privacy of
my extended family, but at the same time it provides my genetic cousins (ie my DNA matches) with all the information they need.
To
upload a tree to Ancestry click Trees in the
main menu, then choose Create & Manage Trees from the dropdown menu.
Choose Upload a GEDCOM file to upload a tree exported from your family
tree program. You don’t need to wait for your DNA results to upload your tree, but do remember to attach your tree to your DNA test.
Everything
I've written about so far can be done before you get your DNA results,
so that you can be ready to "hit the ground running" when they
arrive. But if you've already had your DNA results it's not too late to go back
and fill in the gaps – indeed, it would be foolish not to.
NOW THAT YOUR LONG-AWAITED RESULTS ARE FINALLY THROUGH…..
Why you should ignore your ethnicity estimates
That’s right – ignore
them! Either the estimates will match what you know, in which case you’ll
believe them, or they won’t in which case you’ll think they’re a load of
rubbish.
Whichever it is, the
chances of them helping you knock down any of your ‘brick walls’ is slim, and
they’re more likely to lead you down blind alleys – so don’t waste your time
puzzling over them.
Note: when I give presentations on DNA I often
include slides which show how my own ethnicity estimates have varied over time,
and how they differ from reality. There are a whole range of reasons why
ethnicity estimates are unhelpful – an obvious one is the fact that we don’t
inherit equal amounts of DNA from each ancestor, which is one reason why
siblings can appear to have very different ethnic backgrounds even though they
have the same ancestors.
Don’t believe what you’re told about your cousins
All DNA sites will give
an estimate of how closely you’re related to each of your matches: this might
be a single relationship like 2nd cousin once removed, a range such as 2nd – 4th
cousin, or even a list of possibilities with percentages against each one.
These estimates are
frequently wrong – IGNORE THEM! Instead use the chart at the end of this Masterclass
in conjunction with other information (such as age difference).
What NOT to do with your DNA matches!
At
Ancestry you'll typically have over 10000 matches with genetic cousins, and of
those about 97% will be with 'distant' cousins, ie
where the estimated relationship is 5th cousin or more distant. So you might think that the best strategy might be to focus
on the top 3%, on the basis that if you can't make head or tail of those
matches, your chance of resolving the more distant matches is negligible.
But
you couldn't be more wrong – in practice your 'brick walls' are most likely to
be solved by matches that Ancestry regards as distant! This is partly because
nobody, not even Ancestry, can accurately determine precisely how close a DNA
match is once you get beyond 1st cousins – for example, one of my 3rd cousins
and closest collaborators is shown by Ancestry as a 5th to 8th cousin because
the amount of DNA we share is much lower than the average for 3rd cousins (but
still within the normal range).
Another
reason distant DNA matches are often more useful is that it’s more likely you’ll
be connected to them on the other side of a ‘brick wall’; for example, they
might be descended from the parents or grandparents of your ‘brick wall’
ancestor. One of my oldest ‘brick walls’ came tumbling down as
a result of DNA matches with cousins who were descended from my ancestor’s
previously unknown siblings.
All
this means that simply working your way through the list from the top isn’t a
great strategy. Whilst you’re bound to be curious about names that you don’t
recognise, trying to pinpoint them all on your family tree simply isn’t
necessary – and it will inevitably lead to wasted time and frustration, not
least because many of them won't have trees, and some won't reply to your
messages (not everyone who takes a DNA test is a keen family historian).
Having
worked with DNA for 12 years, during which I have taken just about every DNA
test on the market, I’ve learned that not only is the Ancestry DNA test head-and-shoulders
above the rest, the best way to make the most of your
test is to let Ancestry do as much of the hard work as possible.
Note:
most of the tools require a subscription, but the new AncestryDNA Plus
membership is only Ł14.99 for 6 months in the UK (or a little more in other
countries), and with Ancestry DNA you can achieve an awful lot in 6 months!
If you have a very recent unknown ancestor
If
you have a very recent unknown ancestor, ie a parent
or a grandfather, and you don’t know what surname you should be looking for,
follow the approach described in this case
study. Ancestry allow you to group relatives (see
the next section) so you don’t need to create a spreadsheet as some genetic
genealogy gurus have suggested – that would simply complicate matters.
Decide how you will use Groups
Ancestry
allow you to group matches together – you can have up
to 24 groups, and when you add one of your matches to a group a coloured circle
will appear (each group has a different colour). A good way to make use of groups
is to allocate one to each of your 16 great-great grandparents (or rather your
16 pairs of great-great-great grandparents) and reserve the remaining 8 groups
for special projects.
I
use blues and greens for my father's side of the tree and reds and yellows for
my mother's side, but how you make use of the groups is entirely up to you.
Common Ancestors (subscription required)
The
Common Ancestors feature utilises online trees to figure out how you and
some of your matches are connected. It's something you might be able to do
yourself if you had unlimited time and a brain like a computer, but having
Ancestry do it for you will provide a real boost.
About
1.5% of my DNA matches are flagged as having common ancestors, but what really
stands out is that more than half of them are distant matches, and some of them
have very small trees, as in this example:
You
might be wondering how Ancestry can figure out how one of my distant cousins is
related to me when she has only 4 people in her tree – it’s because they're
looking at ALL the tens of millions of online trees in their database, not just
the ones that belong to my DNA matches. That's why you'd need unlimited time
and a brain the size of a planet to do it yourself!
In
this case clicking reveals
that the common ancestors are our great-great grandparents William Pepperell
and Mary Ann Burns – making her my 3rd cousin, though once again the amount of
shared DNA is below average for a 3rd cousin, which is why the suggested relationship
is 4th to 6th cousin.
When
the common ancestor(s) are shown click the name of the ancestor to see how the
two of you are descended from that person.
Always
bear in mind that online trees often include errors – just because you have a
DNA match with someone doesn't mean that their tree is correct, although it
certainly improves the odds! However the information for each generation will
usually be supported by multiple trees uploaded by different users, which is
another encouraging factor.
When
I've verified the connection I add a brief note against the DNA match at
Ancestry, then add the new cousin to the relevant group or groups (4th cousins
belong to one group, 3rd cousins to 2 groups, and 2nd cousins to 4 groups). Finally I add them to the family tree on my own computer,
which often entails adding a new branch. At this point it oftens becomes
apparent that there are relatives I can add to the My Ancestors page at
the LostCousins site (to find further cousins), and doing it immediately ensures
that it isn’t forgotten.
Note:
the fact that Ancestry can only identify Common Ancestors far a small
percentage of your matches doesn’t mean that the others don’t share your
ancestors – only that there isn’t sufficient information in your cousin’s tree
and/or other Ancestry trees to enable the link ro be found..
ThruLines™
(subscription
required)
Ancestry's
ThruLines™ feature uses Ancestry trees in an attempt to knock down 'brick walls'. It was introduced
before Common Ancestors, which it overlaps to an extent, but it's still
worth checking out.
When
you access ThruLines™ it displays the
direct ancestors on your tree, generation by generation, and as you move the
mouse over each box it indicates matches with genetic cousins who share that
ancestor. Even if you don’t have an Ancestry subscription you can see how
you’re connected to those cousins, and as with Common Ancestors the
algorithm utilises all Ancestry trees, public and private searchable, not just
those that belong to your DNA matches.
Where
ThruLines™ really pays off is when it
knocks down 'brick walls', by suggesting possible ancestors who don't appear on
your tree. These are usually highlighted in green (rather than pink or blue) -
the screenshot below shows an example:
Tip:
any clues you get from ThruLines™ should be carefully
checked, just as you would any other hints – don't assume that just because the
other person is a DNA match their tree must be correct. And the chances of it
being correct don’t improve just because there are multiple matches who have
the same information in their tree – it could just be that they’ve all copied
the same error.
Even
if ThruLines™ doesn't break down any of
your 'brick walls' immediately, bear in mind that it will be updated as other
users test, and as those who have already tested add to their trees. It’s worth
checking back now and again.
As
you've worked your way through your Common Ancestors matches, and your ThruLines™ you'll have been able to make
notes against many of your matches to indicate how you're connected to them.
But still the vast majority of your matches, even your
close matches, will have nothing against them. The next step is to fill in some
of the gaps by making use of Shared Matches.
Shared Matches (subscription required)
There
are two distinct ways to use Ancestry's Shared Matches feature, and they
won't necessarily produce the same results – this is because Ancestry only
shows shared matches of 20cM or more.
The
first way is to work through your close matches (the ones who share 20cM or
more with you); this will reveal which of your other close matches they also
share, even if they don’t have trees of their own, or have minimal trees. Don’t
jump to unjustified conclusions – for example, just because cousin A is a
shared match with cousin B, who shares your Smith and Jones lines, doesn't mean
that cousin A also shares those lines, because the connection could be further
back.
The
second way to make use of Shared Matches is to start with the cousins
whose connection you already know, thanks to Common Ancestors and ThruLines™. Many of them will be distant
cousins of yours, ie they share less than 20cM with
you, but that doesn’t stop them sharing more than 20cM with some of your close
cousins. For example, I have 8 shared matches with the 3rd cousin I referred to
previously, even though Ancestry tell me that we only
share 10cM of DNA.
The
latter approach has the potential to pick up more shared matches, so it’s well
worth doing.
SideView (subscription
required)
The
enormous size of Ancestry’s DNA database allows them to deduce which side of
your tree a match belongs to. It’s not a perfect science – there will be
mistakes – but it will help prevent you wasting time trying to find connections
where none exist. For example, if you find one of your ancestral surnames in
the tree of one of your genetic cousins, but Ancestry are
suggesting that the cousin is on the wrong side of your tree, the chances are
that the surname only appears by chance.
Note
that rather than referring to paternal and maternal, Ancestry refer to Parent 1
and Parent 2 – it’s up to you to figure out which is which, based on known
relationships, and tell Ancestry..
What to do next….. key strategies
Making
use of the simple tools that Ancestry provides is a great way to make some
headway, but you're really only scratching the surface
– the real discoveries will come when you follow the tried-and-tested
strategies below. In most cases you’ll benefit from having an Ancestry
subscription – without a subscription you can only see 5 generations of your
matches’ trees.
The
key thing is that these simple, straightforward strategies will lead you to the
matches most likely to help you knock down your 'brick walls':
Strategy
1: search by surname
Ancestry
allow you to search the trees of your matches by
surname, so that you can identify cousins who have the same ancestral surname
in their tree as one of your ancestors.
There
are two factors that make this a particularly useful strategy: one is that the
search only looks at ancestral surnames, so ignores names that only appear in
branches of your match's tree; the other is that the search looks at private
trees as well as public trees (provided those private trees are designated as
searchable, which almost all are).
Here's
how to go about it:
Strategy
2: search by birthplace
As
you will have discovered when working through your list of surnames, most of
the time the surname of the ancestors you share with a DNA cousin doesn't
appear in both trees - indeed, it's quite possible that the surname of your
common ancestor doesn't appear in either tree!
The
problem is, when your female ancestors married they
generally took their husband's surname. This makes it more difficult to
research female ancestors whose children were born before the commencement of
civil registration, since baptism registers don't usually give the mother's
maiden surname - often the only solution is to find the marriage. By contrast
you can continue researching your male ancestors even if you can't find their
marriage.
Tip:
it’s worth checking the baptisms of your ancestor’s siblings in case one of the
register entries gives the mother’s maiden name.
Of
course, this problem doesn't simply affect you and your research - it affects
your cousins too; most researchers' trees become increasingly sparse with each
generation. If you've only identified 10% of your 256 6G grandparents and your
cousins have only identified 10% of theirs, the odds of finding out how you're
related to a 7th cousin simply by comparing the names in your trees are pretty remote (a little more than 1% in this example, not
great odds).
Another
way to figure out the connections to your DNA cousins is to look for
geographical overlaps - and here's how to go about it:
Strategy
3: look for overlaps with the more unusual components of your ethnicity
Most
readers of this newsletter have mostly British, Irish, or western European
ancestry. But some of you will have Jewish ancestors, ancestors from eastern
Europe, or ancestors from outside Europe, and whilst ethnicity estimates can be
quite misleading, they do provide another way of analysing your matches.
Here's
what Ancestry show for one of my DNA cousins:
If
Ancestry had detected a Jewish component of my own ethnicity this would be one
of the matches I'd be looking at very closely.
Strategy
4: look for the 'elephant in the room'
We
all have numerous 'brick walls' in our trees, so there are parts of our
ancestry that are a closed book – and yet there will inevitably be clues
amongst our matches, if we only look for them. For example, if you don't know
of any Irish ancestors, but have lots of matches with cousins who do, you might
begin to wonder whether one of your 'brick walls' is concealing a connection to
Ireland – it certainly was in my case. I can't provide you with a step-by-step
guide - it's all about awareness and open-mindedness.
But
beware of the common situation in which you share a single DNA segment with
lots of people who all match each other. This suggests that the people you’re
matched with come from an endogamous population, one in which people generally
marry within the same community - in this case you would probably do well to
ignore the matches altogether as any connection is likely to be a long way
back.
Always remember WHY you tested!
Unless
you you or one of your parents were adopted, or had
an unknown father, the chances are that you didn’t take a DNA test in order to find living cousins – you took it in order to
knock down some of the ‘brick walls’ in your tree. Finding living cousins who
share your DNA is a necessary step in the process, not the ultimate
goal.
This
is why earlier in the Masterclass I warned against working through your list of
matches from the top. It would be a good strategy if your primary objective was
to add more living cousins to your tree, but it’s a very poor strategy if your
real objective is to knock down ‘brick walls’, and get
further back on some of your ancestral lines.
Tip:
the same applies to the LostCousins project to connect family historians around
the world – although finding cousins and sharing information with them is a key
part of the process, one that frequently adds detail to our knowledge of our family
history, the greatest benefit comes from collaborating with our ‘lost cousins’ in order to knock down ‘brick walls’.
This
is a very long Masterclass, so you could easily miss out one of the steps by
accident. The checklist will help to ensure that you don’t omit any important
parts of the process, because as with any recipe leaving out a single
ingredient can make a big difference!
HAVE
YOU…..
o
COMPLETED
your My Ancestors page, entering not just your direct ancestors and
their families but also the other relatives who share some of their DNA (in
other words, their cousins – all of whom are also YOUR cousins)? Bear in mind that
the 1881 Census is the one most likely by far to connect you to living cousins,
even if your direct ancestors had emigrated long before
o
COMMUNICATED
with the COUSINS you have been matched with, or already know, to find out
whether they have already tested and are prepared to collaborate?
o
LISTED
ALL of your ancestral SURNAMES, not just the ones
you’re currently focused on?
o
UPLOADED
your tree and LINKED it to your DNA test?
o
REVIEWED
your THRULINES™ in case someone has already broken down one of your
‘brick walls’?
o
CHECKED
your COMMON ANCESTORS matches and allocated them to the relevant groups?
o
REVIEWED
your SHARED MATCHES in case they provide clues that will help you knock down a
‘brick wall’?
o
SEARCHED
for every one of your ancestral SURNAMES in the trees of your matches and made
relevant notes against those cousins?
Warning – traps for the unwary!
Keep
it simple
There
are lots of tools and techniques that have been developed or promoted by
genetic genealogy gurus. I haven’t tried most of them, and do you know why?
Because when people say to me “You really should recommend such-and-such” my
response is invariably “In what way has it helped you, how many ‘brick walls’
has it knocked down for you?”. At that point the discussion normally goes very
quiet….
Beware
of making unwarranted assumptions
Let’s
suppose that you look at shared matches for a genetic cousin who has no tree,
and some – or maybe all of them – have the same coloured
dot against them, indicating that they all descend from the same pair of ancestors.
Can you assume that this mystery cousin is also descended from those particular ancestors?
It
would certainly be convenient if that were the case, but it isn’t - the common
ancestors could well be one or more generations further back. Here’s a simple
example from my tree: my cousin Jane is a shared match with my 1st cousins, who
are all on my mother’s side, which means they are descended from my maternal
grandparents. Jane is also on my mother’s side, but our common ancestors are
much further back - since Jane is a 3rd cousin she and I
share just one of the 4 pairs of great-great grandparents that I share with my
1st cousins.
Most
of the matches we make with DNA cousins will be many generations back, since we
have many more distant cousins than we do close cousins. The final column of
the table below indicates roughly how many cousins you might expect to find if
you and they all took the Ancestry DNA test:
Based
on Table 2 from: Henn BM, Hon L, Macpherson JM, Eriksson N, Saxonov
S, Pe'er I, et al. (2012) Cryptic Distant
Relatives Are Common in Both Isolated and Cosmopolitan Genetic Samples. PLoS ONE 7(4): e34267. doi:10.1371/journal.pone.0034267
Revised
using Ancestry DNA estimates for the chances of detecting cousins and the
expected number of 1st to 6th cousins for those of
British ancestry; the numbers for 7th to 10th cousins are my own guesstimates
Of
course, in practice only a small fraction of your cousins will have tested -
even Ancestry, by far the biggest providers of autosomal tests, have sold only
25 million tests - but you can nevertheless reckon that the cousins you're
matched with will be distributed roughly in proportion to the figures shown
above. In other words, over 98% of your matches will be with relatives who are
at best 5th cousins, and could well be 8th cousins or
even more distant. This won't necessarily be apparent when you look at your
list of matches because there's a tendency for matches to appear closer or more
distant than they really are.
Tip: Ancestry won't
show any of your DNA matches as more distant than '5th to 8th cousin', but it's
very likely that amongst them there are many who are more distant. Once you get
beyond 3rd cousins the length of the shared segment(s) is only a very rough
guide to how closely you are related - you could share a 20cM segment with a
10th cousin, but no detectable DNA with a 3rd cousin. The same limitations
apply at other sites too, of course.
This
amazing chart from Blaine Bettinger's blog shows how variable the
amounts can be, and how this affects the amount of DNA shared by more distant
relatives. (See the blog for full details of how it was compiled.)
In
each box there are three figures: the lowest and highest amounts shared between
relatives of each order, together with the average.
What
you will notice is that the average stabilises at around 12 or 13cM even for
the most distant relationships shown. For example, you can see from the first
table that the average DNA shared between 8th cousins is just 0.055cM, but the
average in this chart is 200 times greater. How can this happen? It's because
unless there's a matching segment of at least 6 to 10cM most companies won't
report a match at all - and since the averages in the chart only includes
matches which were actually detected, it bumps up the
average quite considerably.
Very
interesting, you might think - but what does it actually mean
in practice? What it tells us is that neither you, nor I, nor any of the DNA
companies can reliably predict how closely we are related to our more distant
cousins. So don’t rely on any estimates of how closely you’re related to a
cousin: look at the chart and figure out what's possible, then consider what's
likely (this means, for example, taking into account
your age and that of your cousin).
Save on Hiding the Past ENDS MONDAY
If
you live in the UK or the USA there’s an opportunity to buy Hiding the Past,
the first book in Nathan Dylan Goodwin’s wonderful Morton Farrier series of
genealogical mysteries. I know that many people reading this newsletter will
have read not only the first book, but most of the other 9 books in the series –
but for those of you who have missed out so far it’s a great opportunity
to discover why I, and so many others, are great fans.
Sadly the offer ends tomorrow (Monday 18th
March) but hopefully you’re reading this in the nick of time!
When
I was a boy my mother only bought fresh cream at
Christmas – the rest of the time we had evaporated milk or, occasionally, tinned
cream – so the cream at the top of the milk was a much-prized treat. We used to
take it in turns to have the cream on our cornflakes – provided the sparrows didn’t
get to it first while it was waiting on the doorstep (in that case we all
missed out).
I
can’t remember when homogenized milk took over, but it certainly made breakfast
less interesting. There was one benefit however – much as I enjoyed the ‘top of
the milk’ on my breakfast cereal, it was the other way round when it came to ‘school
milk’ – and I don’t think I was the only one who disliked it!
Reading
the story about the baby who was born on a plane reminded me of a rather
cramped flight I took with a well-known Irish budget airline. It shouldn’t have
been that way – my wife and I had paid extra for the additional legroom that
comes with exit row seats – but at some point between
booking and travelling the plane was changed to a shorter version of the Boeing
737, which meant that the over-wing exit rows were 16 and 17, rather than 17
and 18 as in the original configuration. We, of course, had innocently booked seats
in row 18 – but at least we had allocated seats, unlike the people who had
booked rows 34 and 35.
Can
you imagine how difficult it was to get a refund of the modest sum we’d paid for
extra legroom? It took about 6 emails, the last of which ended with the
sentence “Please pass my query to a human being so that I can get a relevant
reply, and not another dumb response from your AI.”
We’re
supposed to shrink as we get older, but I’m still just over 6ft 4in, so I
really do appreciate a little extra room. In future we’re going to choose row
17 – that should be a fairly safe bet, at least until Boeing
come up with an even longer aircraft.
This is where any major updates and corrections will be
highlighted - if you think you've spotted an error first reload the newsletter
(press Ctrl-F5) then
check again before writing to me, in case someone else has beaten you to
it......
Peter Calver
Founder, LostCousins
© Copyright 2024 Peter Calver
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