Difficult DNA Assume my father's direct 2nd grand parents were actually brother and sister, and my father and grandparents are deceased, is there a clue in my DNA that my 3rd great grand parents were brother & sister? Reply
Assume my father's direct 2nd grand parents were actually brother and sister, and my father and grandparents are deceased, is there a clue in my DNA that my 3rd great grand parents were brother & sister?