No, I know that, I've seen this. I mean I'm sure he's said it before (when he joined the team @ 19), that's obviously the mindset of every single player who graces any NBA team.
As for his mom, yes I heard that rumor, but who really knows? The public has such an appetite for bullsh!t they could say anybody slept with his mother/wife/girlfriend/mistress/accountant and a half the NBA fans without knowing anything about it would say it's true because they like that drama... NBA on TNT, We know drama.