User blog comment:D. Cello/Assassinews 10/11 -- Desmond's Ancestry Revealed/@comment-75.71.100.89-20111012232436/@comment-4499860-20111013014112

That doesn't bother me that much, even if they all were related, it still wouldn't make sence, as it's a scar, not a birth mark. Ezio got it from that rock, and Altair and Desmond who knows.