User blog comment:Master Sima Yi/Assassinews 19-03-'14 – Two Assassin's Creeds for 2014?: Unity and Comet/@comment-5174994-20140613210142/@comment-4254431-20140613212649

I thinking both of Arno's father's knew each other. His biological father died when he was young and a friend promised to care for Arno becoming his adoptive Daddy. The adoptive dad will also probably die when Arno is in his 20's thrusting him into the brotherhood.