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Family Finder Advanced Topics Advanced discussion about Family Tree DNA's Family Finder Product.

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  #1  
Old 1st July 2017, 09:20 PM
Wally Knox Wally Knox is offline
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Autosomal Match with Adopted Relative

A newly found cousin (female) and I (male) have been trying to solve the problem of a common ancestor. The problem concerns the fact that her father was adopted and she doesnít know the names of her father, grandfather or grandmother. We have an Autosomal DNA connection (attached). There was no X-Match. This connection appears to be on my fatherís side. All of the matches from Ancestry, FTDNA, and GEDMATCH that we share with other individuals are from my dadís side of the family. My cousin is probably one generation younger than I am. I hope that the information here can help in giving us some insight into whether her grandfather or grandmother is my ancestor (father, grandparent, uncle or aunt). I may not be making a lot of sense but we are trying to find out if our common ancestor is a male or female relative of mine. Can the DNA data from GEDMATCH (attached) help? Any information would be helpful. Thank you for bearing with me. Apologies for a very long post.
Autosomal GEDMATCH.pdf
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  #2  
Old 2nd July 2017, 12:30 PM
John McCoy John McCoy is offline
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The key is the "estimated generations" back to the Most Recent Common Ancestor (MRCA). The estimate is 2.8, roughly equivalent to second cousins. However, it could well be first cousin once or twice removed, or even half first cousin (up to once removed). You are definitely on the right track, this sort of match is way too strong to be just some sort of statistical fluke.

It may be useful to concentrate on the specific segments that are shared with your identifiable relatives and also with more distant matches (check all combinations). You may be able to find a segment that is consistent with only one possible line of descent.

In fact, I think it would be helpful to sketch out all the possible ways you could be related, consistent with the level of matching, and then work out what predictions can be made for each case. For example, for each possible solution, what is the predicted degree of matching with your other paternal relatives? Good luck!
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Old 2nd July 2017, 04:07 PM
Wally Knox Wally Knox is offline
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Autosomal Match with Adopted Relative

A new perspective can make all the difference. I will look into your suggestion on the "specific segments that are shared with your identifiable relatives." At this time, just about all of my relatives are distant. A new avenue of investigation opens up. Sketching out all possibilities is another great idea. This will be a challenge. Thank you for your help.
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Old 2nd July 2017, 05:50 PM
georgian1950 georgian1950 is offline
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Quote:
Originally Posted by Wally Knox View Post
A new perspective can make all the difference. I will look into your suggestion on the "specific segments that are shared with your identifiable relatives." At this time, just about all of my relatives are distant. A new avenue of investigation opens up. Sketching out all possibilities is another great idea. This will be a challenge. Thank you for your help.
Hi Wally,

If you aren't already using it, you might consider Genome Mate Pro as a tool to help you find your other matches on these segments. I haven't updated to the Pro version, but I could not have figured out what I have without the using the old version.

Good Luck,

Jack Wyatt
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Old 2nd July 2017, 06:50 PM
Wally Knox Wally Knox is offline
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Thank you Jack. I will check it out. I need all the help I can get.

Wally
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  #6  
Old 2nd July 2017, 07:13 PM
travers travers is offline
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Quote:
Originally Posted by Wally Knox View Post
A new perspective can make all the difference. I will look into your suggestion on the "specific segments that are shared with your identifiable relatives." At this time, just about all of my relatives are distant. A new avenue of investigation opens up. Sketching out all possibilities is another great idea. This will be a challenge. Thank you for your help.
How do you know all the matches you share with this person are from your Dad's side of the family if you mostly share distant relatives? Have you actually found connections with these distant matches you share with this person or are you assuming based on something else? What makes you believe this person is from your father's side? You might be right in your assumptions but I was wondering what made you come to your conclusions as you for some reason mentioned the X Chromosome and I was hoping you aren't jumping to conclusions based off that.
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  #7  
Old 2nd July 2017, 08:09 PM
Wally Knox Wally Knox is offline
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I provided my cousin the names of seven individuals that have DNA matches to me (one 1st cousin and the others more distant). Three were matches to my mom's side of the family and four were matches to my dad's side. When my cousin checked, he had matches to all four from my dad's side and none from my mom's side. Not sure how conclusive this is but it was our starting point.

Wally
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