There's no excuse to throw a 14-year-old out on the street, no matter what. My parent's house was often a way-point for kids like that - you never knew who would be sleeping on our livingroom sofabed. Does the kid have any other relatives he could stay with?

It sounds, on the surface, like something was said in anger, maybe by now someone could sit down with the dad and kid and talk to them - if not you, a counselor, pastor, or someone else they'd trust ...