My cousin DM got a new 3rd cousin match, DB, on her Ancestry.com DNA page that was listed in two of her DNA circles even though those ancestors did NOT appear on that match’s tree! Wow, is ancestry really able to make this call just from the DNA? There is no shared ancestor hint with my cousin. (By the way, each member of the couple who provided the DNA gets their own circle; in this case Sigri and Bard Nelson.)
After looking at DB’s tree I see that he has a Selmer Nelson on his tree who is a known descendant of the couple Bard and Sigri Nelson(Nielsson) who make these two circles. So he clearly does belong and his tree just does not go back that far.
Using the shared matches tab on this match’s page, I find that this new match, DB is in common with yet another match in these two DNA circles, BK with whom he is more closely related; they both have Selmer Nelson as a grandfather. BK does not have a green leaf with my cousin JM because he has spelled Bard Nelson and Sigri differently.
However BK is also a shared match with DK who DOES have a green leaf DNA ancestry hint with my cousin. DK shares Selmer’s dad J.B. Nelson with DB and BK. Aha, perhaps that is how this was figured out. Both BK and DK have Bard Nielson in their trees but DK spelled it the way we did. Now perhaps I understand how Ancestry put DB and BK in these circles! Continue reading
Perhaps this post needs the subtitle , “My Perfect Cousin Goes to GEDmatch.”
Most of us can keep track of information in spreadsheets. So how to do that with DNA? Well, the idea is to keep a list of matching DNA segments so that a new match can be compared to your known family members. That way you may be able to see where they fit in.
If you have tested at 23andme or Family Tree DNA, you can download your list of matches with their matching DNA segments either directly from your testing company or by using the tools at DNAgedcom. However AncestryDNA does not provide a list of matching segments.
Extract from my Dad’s Master DNA Segment Spreadsheet (click for a larger version)
Why would you want those? The short answer is to figure out which line a new DNA cousin belongs to. For the long answer, read on. For more posts about DNA spreadsheets click here or in the tag cloud, lower right hand column.
AncestryDNA testers can make a DNA segment spreadsheet by using any of a number of utilities at the GEDmatch web site. Start by uploading your raw DNA data (click here for that “how to” post). Your results will usually be ready for full comparisons the next day. Then buy the tier 1 utilities for at least one month ($10).
My preference for making a first spreadsheet is to use the GEDmatch Matching Segment Search. Then I go through the top matches from the ‘One-to-many’ matches report with that spreadsheet as a reference. I add notes on what I discover to my new spreadsheet.
Here is the step by step of what I did for my perfect cousin J.M. whose AncestryDNA results I blogged about in my previous post.
This is the first time I have had a cousin’s DNA test come out showing an ancestry composition that was 100% a single ethnicity. My cousin J.M. was not in the least bit surprised as she expected to be all Scandinavian. Five of her eight great-grandparents were born in Norway and the other three were born in the U.S.A. to Norwegian immigrants. But I was quite surprised because there is usually at least a trace of something else.
She shares my Norwegian born Munson (Monsen) great-grandparents as her great-great-grandparents making us 2nd cousins once removed. She tested at AncestryDNA to help me figure out where a related adoptee might fit in (no luck on that). The fact that she has a genetic genealogist for a cousin who would tell her what it all meant helped convince her as well.
I usually send cousins to my page comparing all the autosomal tests and let them choose. However I prefer Ancestry.com DNA testing for the interested, but non-genealogically serious, relatives who are online because it is so easy to see the relationships and use the green leaf hinting system. Also I was tired of having only one circle and her test would give me a second one. Those with colonial ancestry have plenty of circles and NADs (New Ancestor Discoveries) but we recent immigrants (1870s and 1880s) are lucky to have any. Last but not least, it was the cheapest test at the time she ordered it.
Now why is she perfect? It is not just the 100% Scandinavian but amazingly her top four matches are all second cousins from different pairs of great-grandparents! I have never seen that before either. Of course most of my tested relatives being from relatively recent immigrants, have no second cousins and almost no thirds showing at Ancestry .
Here are J.M.’s matches: