Boyfriends Crazy Family

So for the past 8 months I've been dating this guy, and every time we're with each other he is FORCED to bring his little brothers because his mom. I'd be okay with it if his little brothers weren't psycho. Literally, we'd be sitting watching a movie and his little brother would start screaming and crying because the other brother mad him mad and would pull out one of our kitchen knifes saying, "I HOPE SATAN BURNS YOU ALIVE WHEN I KILL YOU". Like that's crazy! What should I do?