Dealing with a father and son team as hunting partners is difficult because blood is thicker than water.You cant win in these situations and I have been through a similar dilema but not so severe.I would talk with the father as he is a long time friend and tell him Nick is out.You may still want the father to hunt with you but I would take into consideration your sons view and how he feels.If you have a loose cannon in camp his behaviour (drug use etc) can bring dirsrepute on you and your camp,simply not worth it.IMHO.