Hi Abby. Your brother is lucky to have you. What you described is scary. My first thought is that he sounds like he went through some trauma. Is there a friend or family member he used to spend time with or was close with that suddenly he doesn't want to be around or alone with? Many churches have pastoral counseling. Maybe your folks would go for that. He obviously needs some help. Be there for him the best you can and maybe you can find some literature for your parents. Good luck. I really pray he gets the help he needs. Annie