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General => Ancestral Family Tree DNA Testing => Topic started by: ozdelver on Tuesday 01 December 20 03:56 GMT (UK)
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Hi,
I have come across a name of a possible DNA match from a family line I am keen to track down, as it will help identify a birth father for an adoptee. However, I can no longer find it in my list of matches, so I think it may have been in the 6-8cM block that Ancestry deleted. My understanding is that it is gone forever.
If my results are uploaded to another Genie site will they give me matches down to that level? Does anyone know what the cut-off level is on other sites?
Or would I be better off uploading to Gedcom and seeking a match there?
Thanks
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Not sure if this is up to date but it might help:
https://isogg.org/wiki/Autosomal_DNA_match_thresholds
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What you upload to other sites is your raw data, not the original site's interpretation of it, so I would say that the cut-offs could be different, you won't know till you try. Upload to as many as possible for the best coverage, and if you've tested with more than one company there are tools out there to merge your own tests and fill in some of the gaps (what gedmatch call overlap)
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If they're only on Ancestry and not on other sites and if you have the Ancestry name of the person, why not look them up on the member search
https://www.ancestry.co.uk/community/membersearch
and send them a message.
Gadget
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Hi all,
Thanks for the responses.
After reading the article recommended by Gadget, I think my best bet will be to upload to Gedcom and do a one-on-one comparison. I have the Ancestry match's username, and a related third party who has worked with her, and is also using Gedcom to compare her matches. I will get onto her and see where we can go from here.
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A low cM does signify quite a distance in the past before a common ancestor is likely to be found, it is all on probabilities.
There is also no guarantee that the match is going to use a recognisable visible name elsewhere or even that they will have uploaded to another website.
I know it is after the horse has bolted for you but before Ancestry removed the low cM matches I went through hundreds of matches up to 9 cM and gave those with a sizeable tree or a user name that I recognised a Group colour coded marker labelled Research Further, I still have access to those low cM matches.
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A low cM match, does not always signify a very distant ancestor! I have a lowest possible match, at 6cm, that I tagged so it did not disappear. He is my 2nd cousin 2 times removed! His grandfather and I are second cousins. All 3 of us are alive, as it were ;D :D
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A low cM match, does not always signify a very distant ancestor! I have a lowest possible match, at 6cm, that I tagged so it did not disappear. He is my 2nd cousin 2 times removed! His grandfather and I are second cousins. All 3 of us are alive, as it were ;D :D
True 6cM giving a 2C2R then the probability of it being this is way less than 1%.
As opposed to a 6cM giving a 6C where the probability of it being this is up at 64%
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You can also contact people who have the common ancestors and the descendats you can remember on their tree
Regardless of wether they have tested.dna or not they may know other family members who.have tested
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Biggles,
Your point is no doubt accurate, I certainly would not argue with that, but.... I also have a 6cm match that is a 3rd cousin 1 times removed, and a 7 cM match that is 3rd cousin 2 x removed and other 7 & 8cM matches in that vein, with two 8cM matchs who are 3rd cousin 1x removed for example.
So, maybe I am very unusual , I guess?? These are plucked from my common ancestors list.
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Jane it would make you unusual are you sure neither of you are descended from.half siblings somewhere along the line being half second cousins twice removed is more likely
Or someone passing off a grandchild as child so you could actually be 3 x removed
Hard to prove or disprove
* I take that back. it could be proved if other full cousins had a much.higher cm range for same relation
I do have a 3c1r who only matches me by 10cm and my cousin by 19cm and as far as Im aware the common ancestors are same married couple
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All down to the randomness of DNA distribution.
My s-i-l has a 2nd cousin who she shares 252cm with.
My son shares a mere 13cm as their 2C1R.
Son and s-i-l share 1974cm.
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Biggles,
Your point is no doubt accurate, I certainly would not argue with that, but.... I also have a 6cm match that is a 3rd cousin 1 times removed, and a 7 cM match that is 3rd cousin 2 x removed and other 7 & 8cM matches in that vein, with two 8cM matchs who are 3rd cousin 1x removed for example.
So, maybe I am very unusual , I guess?? These are plucked from my common ancestors list.
Anything is possible, it is down to probabilities which in turn effects the potential work you have to put in to link a match.
My 364 cM match is my major headache (there is a thread about it) and no matter what I do I cannot so far make the link despite her being in the 1-2C DNA ballpark which accounts for 98% of the probabilities. Hence as Brigidmac suggests full Cousin DNA mapping can help, I am trying to get a trio of my own Cousins to do the test to help solve our conundrum.
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Interestingly, my original example, the 6cm, 2nd cousin 2 times removed,where the young lad's grandfather is my 2nd cousin, well the grandfather is also a match for me,he matches me at 182cM, which would be, according to DNA painter, 38% likelyhood of being my second cousin. His grandson has been checked in the records, and manages his GF's results. He talks about his granda, and I have no doubt that is his relationship. Although I dont know either of them personally, the grandfathers mother was a very close friend of my mother, being 1st cousins. We are from a very close, of irish origin family group, in Scotland, and I have very many matches in that part of my family tree.