- D O'Brien's Profile
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- D's formal name
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D O'Brien's DNA has been tested for genealogical purposes. It may be possible to confirm family relationships by comparing test results with D or other carriers of his ancestors' Y-chromosome or mitochondrial DNA. Y-chromosome DNA test-takers in his direct paternal line on WikiTree:
- D O'Brien: Family Tree DNA mtDNA Test Full Sequence, haplogroup J2a1a1a2
- A O'Brien : AncestryDNA, GEDMatch A520600, Ancestry member ausgenjourneys + Family Tree DNA Family Finder, GEDMatch T594087
- O O'Brien : Family Tree DNA Family Finder, GEDMatch T121407
- D O'Brien: Family Tree DNA Family Finder
- A O'Brien : Family Tree DNA Family Finder
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