I'll give you that one. If the scenario is as you just described I'm changing my stance. Heck, I'll talk to the parents myself. Wanna bet some money?
I'm not much of a betting man nor was that really what I was interested in with this whole ordeal. Just wanted you to stop and think for a minute that maybe there's more to this situation than we were told in the OP. Other than the vague clues he's given us we really don't know what his living arrangement is like.
That and as I've already stated, just because he lives under somebody else's roof doesn't mean he loses his rights as a responsible adult.