well even if family ties have no relevance, maybe he did something to make an impact on sora's life, maybe Ven saved him from drowning when he rough housed with riku too much haha :36:
Haha. No. I doubt something like that would cause Roxas to look like Ven.
araliya:why dont you do the honors?
:3 Thanks.
There's a theory that sometime towards the end of BBS, Ven's heart is forced inside of Sora and later on would stick with Sora's body and soul when it's turning into Roxas and cause Roxas' appearance to change into that of Ven's.
If Ven's heart was damaged or something, there wouldn't be the memories coming up forcibly as such was the case with Kairi's. Ven's heart being in Roxas also explains how Roxas has genuine emotions and why Axel says that Roxas has a heart.