My friend was pulled out of school just before Christmas in 2016 and no one has seen him since and my friends and I haven't been able to contact him since early January while my friend (he lives in the same neighborhood and they hung out frequently) and his parents suspect that his dad may be hurting him as they have cut off comunication while he was also trying to avoid talking about why he got pulled out and has only said that he hung out with the wrong types of people and doesn't want to talk about it. What should i do?