Brook, my son is a few months shy of sixteen. They do start to change at that age. There is the hormonal upheaval of course, the fact that they are straddling the divide between boy and man. I think it's natural for teenage boys to feel unsettled, and to act up against the authority in their life. It's a phase... stay steady, and when the dust settles he'll still see you as the good guy. You're the guy who is there for him and his Mom, no matter what. He'll see that again.