This Will Change How You THINK About DNA Triangulation
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- Опубліковано 23 тра 2023
- A lot of genetic genealogists misuse the term "triangulation." This informative video aims to clarify what it really means and how comparing DNA matches can help validate your family tree.
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I’m not sure I would call those bad examples bad triangulation; the question is rather are they USEFUL triangulations!
I agree. If you have a case of illegitimacy that might make first cousins slightly differ in their shared DNA, then using those close matches to determine who lands where is vital. Putting judgment values such as "good" or "bad" on those triangulations seems to deingrate the work needed when close family trees are as tangled as many are.
I'm adopted and have a mystery group of 40ish maternal matches on Ancestry that peak at around 200cM, I can see they don't tally with my maternal grandmother and paper trail relatives to my maternal grandfather have tested and are not a match. I conclude this mystery group must be linked to my maternal grandfather. I've put together a tree for most of these matches who all descend, on paper at least from the same couple. This couple has no link to my paper based tree.
One of the mystery group has tests on both Ancestry and MH, total shared DNA is around 24cM, I can triangulate several names into group but the issue is a lack of trees (or trees that correspond to each other in any useful way), plus a lack of replies to messages. At best all I can see is a certain segment on a certain chromosome is on my maternal side, possibly maternal grandfather but how I can use that is a mystery.
I've tried WATO from DNA Painter, included years of birth and various permutations including/excluding shared cM but the timelines never fit, the most likely hypothesis descend from a female who must have had a child when she was just 13 years old or an unknown half sibling to her but there isn't a test I can run through a chromosome painter to test the theory. So many of this mystery group are so protective of their results and trees I wonder what it is they are hiding.
@@glenjones6980 keep it up! Stay strong.
I never thought about that. I often use my late Aunt, which would be a close relationship. I need to change that!
Now that they can pull DNA from the air and water (Alaska Department of Fish and Game had an article about broadly pulling DNA from sea water recently and many media outlets carried the DNA from the air bit of late), how long until some scientist figures out that decaying bodies DNA is spread outside if the grave and can be sampled in the top layers of soil non-intrusively? That will open up so many opportunities for forensic genealogy!
Perhaps. But the problem is validating who was in the water, ground or air. While the DNA could be interesting, it wouldn't necessarily solve identity questions.
@@FamilyHistoryFanatics Not hard to do with tombstones and modern relatives.
Going round in circles in not triangulation!😹
That is correct.
Your example of the "good triangulation" to me doesn't make sense to me because whether you know the common ancestor or not should not matter. If what you are saying is right then good triangulation turns bad when you finally work out the relationships. This just doesn't make sense to me. I do agree that using close relatives, say siblings, is probably not so helpful, if you are going on the same definition of triangulation that you are using.
I would like to throw into the mix a different kind of triangulation and that is when you and a match and shared match all match each other, but not necessarily on the same chromosomes (those using Ancestry and don't have these matches on say MyHeritage or GEDMatch, and that is probably most people will be in this situation). This to me is another type of triangulation. Now you have to be careful about using this information because, as you showed in a previous video, these may be false matches (or maybe rather shared matches) so maybe go down this rabbit hole a bit, but if you get nowhere, especially if we are talking about distant matches then they may not actually be matches or whatever matches at all, I think we you say said before due to recombination, how the SNPs are taken, and some other facts (I'll note have to go back and watch that other video).
I hope that all makes sense. Maybe a video on using Ancestry's shared matches and triangulation and the limitations of it would be useful?
Me and my 1rst cousin don't triangulate with our 3rd cousin and I don't understand how. There are others the same they dont triangulate with my 1rst cousin.
@@jessikamoore5033 I've just been given access to match lists of distant match of it 100+ year old grandpa, the mother and aunt of the person I'm communicating with, who have a family mystery that my grandpa, and I've found some quirks that aren't evident to me (and I'm a bit of a data geek). I used to think that in your Shared Matches tab of a match it showed all of your matches that a match had an above 20cM match with (and you do as well). This just isn't the case. I'm thinking of reporting this as a bug to Ancestry as it is either just not clear what people call within this list (so I want an explanation) or they need to fix this. The problem I have is that without having access to other match's match lists I'd just never know if these shared matches. Maybe I'm missing something but I just don't trust these lists anymore, but they are the best we have to go on. Either way it isn't good. I think you probably do triangulate it's just the site that isn't giving you correct information (or at best doesn't work the way you think it should).