Summer vacation started for son this week (he is 14). After last year Dad and I decided that we would split summer time. Just take it week by week. So dad picked him up Friday and I thought he would stay the week there. Son called me on Sunday asking to be picked up. I thought that was weird. He told me that his other brother did not get out of school till the next week so he did not want to say. I said ok and picked him, dad said nothing. I thought it was weird that he wanted to come home and when he got in the car he told me that his little brother (who has a history of being really bad and weird)is in major trouble at home. He is grounded from everything and is acting like a brat. HE has had a really bad potty mouth and when he tries to ignore him he does something even worse like hit the little kids or break something or something bad. I guess the other day my somn told him to knock it off and he told him that he was going to get a knife and cut him. I think this kid is really weird and needs some major help. Any thoughts on this? Son does not really want to go over there right now, but dad has not really called to even ask where he is. I can't really say anything because he is not my kid, but what should I do?