My son, the eldest of two, is 16 and is becoming increasingly difficult to live with. He uses vile language in general and sometimes aimed at myself and his Dad, he doesn't talk, is very aggressive and increasingly isolated in his room. he is a perfectly charming, pleasant and driven young man outside the house , did well at school and is currently a FT apprentice in the travel industry. He doesnt seem to want us in his life and I feel I am losing him more each day. Please help