A friend's troubled son. How to be?

I have a friend one. He is married and has a son of 14 years. His friend, frail but always wanted to have a son with combat skills. Constantly bragged to our company, as his son in the Boxing circles all out. The problem he has is happened, that the son began to show character. I mean, I wanted a fancy computer and that's it. If no, then insulting the mother, the father with a fist to the gut. At school it all complain that all lifts and beats. This is reported to parents, and they do what? He beats them too. This is already familiar to all our ears prozhzhuzhal that the pride his son despises. Recently, near its entrance the company was sitting, his son comes home and the father with insults: "Alcuna, come on home, come on in. Alive. The son of this stout and dorowat sized for his age, I made a remark to him that with the father something is wrong, now you take that back. Apologize to your father then. It got me in the shoulder shoved hard, a dick called and drove from the yard. This is the situation. How to be?