User blog comment:Master Sima Yi/Assassinews 02-03-'12 — Leaked AC3 info!/@comment-3519940-20120305024018/@comment-3276576-20120305114219

Aren't most of the Assassins "Children of both worlds"? So pretty much every single Assassin family, which was part of the order since the beginning, is capable of having Eagle Vision then. It was in Desmond too obviously, he just learnt how to use it through the Bleeding Effect.