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New on Geneanet DNA: go further with shared DNA cousins

Posted by Jean-Yves on Aug 3, 2021

Following the DNA segment visualization tool online since last February, we are pleased to show you a new feature on Geneanet DNA: the list of shared cousins you have with each of your DNA relatives! Find out how it works.

A new tool for your genealogy

Studying cousins you have in common with your DNA matches is very useful in genetic genealogy in order to confirm or exclude certain relatives. For example: your name is Alan, and you share DNA segments with Bernard, Eileen and Deborah. You don’t know if, in addition to being related to you, Bernard is also a cousin of Eileen and Deborah.

Go further researching your common ancestors

With this new feature, when you look at the details of Bernard’s DNA relatives, you will see (if they exist) the links between Bernard and your other DNA matches, and the number of segments you all share (sometimes called triangulated segments, since they are shared by 3 persons). From there, very useful deductions can be made, for example:

  • If you know the common ancestors you have with Bernard, and that he has DNA segments in common with Eileen, then it is likely that Eileen shares common ancestors with you and Bernard.
  • On the other hand, if you have DNA segments in common with Deborah, but Bernard doesn’t appear in the list of shared cousins, you can deduct that the common ancestors you have with Deborah are not related to Bernard, and that you are related in some other way.

Another concrete example: if you have uploaded to Geneanet the DNA file of one of your parents, and that one of your DNA matches shares DNA segments with them, then it is quite likely that you are related. This can help guide you towards which side of the family to orient your research. Useful, right?

OK, ready to find your shared DNA cousins?

To use this new feature, click on the “View DNA matches” link:

Next, click on one of your relatives to see more details about them. Shared DNA cousins are visible at the very bottom of this page, under the Chromosome Browser.

This feature is shown as a table with two entries, where each line represents a shared DNA cousin (first column) and your DNA match (second column).

Details shown about shared DNA cousins

In this table, you will see:

  1. The name of your genetic matches and the link to the detailed page of each DNA cousin: these cousins are already in your DNA match list, the difference here is that only cousins related to both you and the other match are shown.
  2. The first column shows the percentage of DNA shared between you and the relative to the left, as well as an estimate of the closeness of relationship.
  3. The second column indicates the percentage of DNA shared between the other cousin and the relative to the left, as well as an estimate of the closeness of relationship.
  4. The number of shared DNA segments, also called triangulated segments: this corresponds to the number of segments shared between 3 DNA cousins. These are probably inherited from the common ancestor of all three individuals, more or less distant in time depending on the number of these segments.

The detection of shared DNA cousins is an additional tool to make the most of your DNA test and to progress in your genealogical research. Geneanet DNA will continue to develop this tool which may be updated, so please don’t hesitate to give us your feedback on the Genetic genealogy forum. Discover new cousins today!

See my shared DNA cousins


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Answer from Geneanet: Please read

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