Quoting Angel [Mariah's Mommy]:" I've tried, he tried to put his head through the wall. I'm beyond frustrated. He's never had any discipline. It don't think it helps that no one can tell me what is actually going on with him. "
I wouldn't kick them out, I'm a super guilty person though. My little brother has similar problems, he is on the Autism spectrum with ADHD and severe aggression issues. Though my parents are very much in tune with him and he is medicated, he still has outbursts like that. He told me if I didn't stop doing something (can't even remember) that he'd punch me in the stomach until my baby was dead (I was pregnant at the time).
All I'm saying is I'm sure he feels really misunderstood and not in control of his emotions. Maybe suggest a child psychologist to his mom if she's interested in helping him at all.