User blog comment:Desmond32/The Piece Of Eden/@comment-2065587-20140328231807/@comment-5019018-20140402204757

If they shared all of each other's ancestors, they'd be brothers or something. Which, I assure you, they're not. They're distant cousins. And if Clay were descended from Altaïr, Abstergo probably wouldn't have needed to find Desmond.