Our 15.5 year old son has locked himself in his room for the past 6 months. He comes down to get food only if I (his mother) am not around and he only eats in his room. He locks his bedroom door and will not let anyone in. He will not talk to me, but will talk to his father and brother, but still only a little bit. He has punched holes in his walls. He has failed some of his classes. He will not talk to a therapist, though my husband has tried to get him to. What can we do?