DNA supports tree? How sure from autosomal?

+3 votes

My grandfather was unsure who his father was. Through a lot of research I think I have him pinned down. The line goes back pretty far. Both my niece and I get:  "It is likely that these autosomal DNA test-takers will share DNA with  

Elmo Perry-7785  My mom
Henry Perry-7797  my grandpa
George Perry-7998  great grandpa
Samuel L Perry-7990 2 great
Abel Perry-1365  3 great?
Ichabod Perry-7991  3 or 4 great
Samuel Perry-7992  4 or 5 great
Joseph Perry-5123  5 or 6 great
Nathaniel Perry-207    6 or 7 great but not my niece
Richard Perry-4950 neither of us
Perry-4924  neither of us
Does this much information lead to a correct conclusion or could it still be just coincidence? 
Abel is either a 3rd great grandfather or uncle.  Would my DNA get the same message for a father and brother? (I think there is a chance Samuel is Abel's son versus youngest brother.)
What does it mean when I match Nathaniel and not my niece?
When I don't match either Richard does that mean my tree info has gone off-track or that I am instead related to Nathaniel's wife and not Nathaniel?
Even if I don't have the correct direct relatives, is there a chance I am in the right line or is this just too many coincidences?
(As an aside I get the same message for all grandmother's line, which I am quite confident is correct as far as it goes.) Thanks for any help. I so want to have great grandpa and beyond right.  Susan
in WikiTree Help by Susan Fitzmaurice G2G6 Mach 6 (63.1k points)

1 Answer

+4 votes
Best answer
To answer your question about the information leading to a "correct" conclusion: no.

The statement means that relationships on wikitree profiles indicate that the test-takers MAY be related to the people on the profiles you listed, and that depends on whether the relationships in the profiles are correct.

To be clear, your statement regarding you "matching" Nathaniel isn't quite clear. That could only be true if Nathaniel himself had a DNA test with which you have compared your DNA test results.

EDIT: looking for relationships to ancestors through DNA test results involves comparing DNA test results among several individuals, and mapping matches to determine (for instance) whether the match occurs on the X or Y chromosome in a chromosome pair, etc., so you can determine if a relationship occurs on your paternal or maternal side. Even then, for relationships beyond a couple generations, determining which ancestor you may have in common relies on research other than DNA - such as well-documented research here on wikitree.
by Bruce Veazie G2G6 Mach 6 (63.7k points)
edited by Bruce Veazie

Regarding your niece, you have an excellent opportunity to do some chromosome mapping. Barring adoptions, undocumented parents, or common ancestors on BOTH maternal and paternal sides, you and your niece likely know for sure which union (husband AND wife) you have in common. That is, your DNA comes from your parents - in 22 chromosome pairs, your father contributed your Y chromosome and your mother in your X chromosome. If you know which ancestors (man AND woman) you and your niece have in common, it is extremely likely that confirmed matches between you and your niece come from those ancestors. If those ancestors are on your paternal side, then you know those occur on the Y chromosome of a chromosome pair. Your niece's matches with be on the X or Y chromosome depending on whether your common ancestors are on her maternal or paternal side.

EDIT: To clarify a bit, DNA test results provide data for each chromosome PAIR, as if the X and Y chromosomes were laid on top of one another. When you find a match, that doesn't tell you whether the matched sequence is on the X or Y chromosome of a chromosome PAIR - i..e., whether it's a match from paternal ancestors or maternal ancestors. Further, that doesn't tell you from which of those two ancestors the DNA came from.

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