On Wikipedia under Ezio de Auditore there is a constant reference to 'Ezio's best friend Arsen' and it stated that Arsen escaped from Florence along with Ezio's sister and mother. I played that part of the game already and I distinctly remember only escorting Claudia and Maria. The wiki article references this Arsen character throughout, but I don't think he's actually in the game. Is somebody messing around with wikipedia?
Article in question:
http://en.wikipedia.org/wiki/Ezio_Auditore_da_Firenze#Ezio_Auditore_da_Firenze
Article in question:
http://en.wikipedia.org/wiki/Ezio_Auditore_da_Firenze#Ezio_Auditore_da_Firenze