Confirming a lineage by DNA

+12 votes

This is a bit of a supplementary to a question asked earlier today.

I've recently had a  small  match on 23 and me on the X chromosome. This is the first  person I have  matched with that I've been able to find a common ancestor. The match  doesn't have a tree on here but does have one elsewhere.

My  ggg grandfather  Arthur was the brother of Jeremiah, my matches ancestor. Because they were males this means the DNA segment in question had to have come from their mother Mary Arthur  (the segment  passed on my side entirely through females, on my matches side there was one generation where it passed through a male but otherwise all females )

At the moment, my match has not got a tree  on here; he does seem to have joined as a guest but no further.   I know I couldn't  accurately source his tree  because his family are in  Canada (don't have good source access)

Could  I say that my paper trail ancestry to my gggg grandmother Mary Arthur is confirmed by DNA?


WikiTree profile: Mary Gurney
asked in Policy and Style by Helen Ford G2G6 Pilot (192k points)
edited by Helen Ford

2 Answers

+5 votes
The DNA Confirmation page advises that you would need at least one more X DNA match on the same segment to form a triangulated group to be able to "confirm" this match.

Based on you having two female line X matches, you could say that this is a likely X DNA match, but requires another test taker to confirm it.
answered by Simon Canning G2G6 Mach 1 (19.5k points)

Thank you,

Sorry it's taken so long to get back, I couldn't find the question.

 I've done a bit more research and  taken the line on here as far as I can go without intruding on privacy.

Here are the x chromosome descendents of Mary Gurney (nee Arthur)

I am the Helen  Ford at the top and my DNA match (39cM on the X chromosome) is the g grandchild of Bessie Lainchburyron the maternal line .

The paper trail matches, the geography matches  (ie emigration from England to Canada,) so surely the DNA serves as confirmation. I'm really not certain as to where triangulation plays a part.


The reasoning behind getting a triangulated group is that it decreases the likelihood of you and the other individual matching through another unknown common ancestor.

X DNA in particular has been found to transfer whole segments unchanged through a number of generations, which means it could actually be from a very early ancestor. This has only recently come to light due to there being more multi-generational tests available for comparison.

By having three (or more) descendants of Mary Gurney showing the same shared DNA segment the probability that the segment is related to Mary increases dramatically.
+1 vote

Mary, you could include the test results for you and your one x match at your own page, or even at the page of your common ancestress, under a heading such as == DNA test results == or == Confirmed DNA relation == or something simliar. I have an autosomal dna match at 23andMe connecting the both of us to our Most Recent Common Ancestors: Charles Emanuel Stones and Harriet Hall (both of Cowick, England.). My match and I are Third Cousins. I did post the results at my WikiTree page and at the bottom of the profile of Charles Emanuel Stones, though i did not call it a Triangulation, which it isn't. However, it is a sort of Dna Confirmation of common ancestry. If my 3rd Cousin (who is a unversity student and very busy) ever finds time to place himself at Gedmatch, then he will also match my four brothers and nephew there, and our Match will become a Triangulation, i think. 

answered by Albertus Robert Casimir Jung G2G6 (7.4k points)
edited by Albertus Robert Casimir Jung

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