DB is 17, very nearly 18. Since he was a young child he'd always be violent towards anyone but mostly my other brother that's 2 years older than him. DM would stick up for him and in her eyes he could do no wrong. He's disrespectful and constantly steals money/things from other brother and me when I still lived at home. But as I said DM didn't believe any of it.
Now he's older DM is trying to discipline him and stop the behaviour but he's much bigger than her and doesn't care. He recently got into a fight, police split it up and took him home and I don't believe any action was taken. DM didn't know what to do to punish him so she didn't do anything. This week he assaulted other brother during an argument, DM told DB to leave because she's fed up with the behaviour and he came here.
I don't want him around me or my DC but DM thinks he may behave differently here.
AIBU?