I'm concerned about my little brother
I (20 F) am very concerned about my little brother's (16 M) behavior.
My brother has always been an abrasive person ever since we were little, but as he's gotten older, his behavior has gotten out of control. He frequently flies into uncontrollable rages but we can't always tell why. I hate to make assumptions about these rages since I have meltdowns too and sometimes, I have trouble discerning the reason for them. If my brother's rages are anything like mine, they are likely just as scary for him as they are for us, but that still doesn't excuse his behavior, which he has never once apologized for. I know he may not know why he's lashing out.
He refuses to do his schoolwork. He loses his mind when anyone tries to get him to do it and not in the regular "I don't wanna do my homework," way, but in the "I'm going to start punching holes in the walls if you make me," way.
He also is extremely entitled and self important. For example, I recently got a Nintendo Switch and I was told by my mother that I cannot bring it with me when I am with the family because if my brother sees that I have one, he will lose his mind faster than our dad lost his hair. Mind you, he already has a Nintendo Switch of his own and it's the same model as the one I got (Lite). He also doesn't use it. He just can't handle the fact that I have something nice. Honestly, I'd kind of like to play with him and our other siblings so I'm a bit disheartened that he'll get so angry.
The entitlement has gone back as far as I can remember. It wasn't anything too bad when he was little. Just regular toddler things, like crying on my birthday because he didn't get any presents. The issue was our father, who coddled him instead of teaching him that he has to share the spotlight sometimes.
I feel my brother needs help, but I don't know how to be of any help. I've tried to calm him when he flies into the afforementioned rages. I've tried giving him space. I try to be understanding, but not invasive since that might be just as overwhelming, but no dice. I try to remind him that it's not okay to say the things that he says, like slurs and making fun of people for things they can't control. Our mother has also done this. Nothing. My mother has put him in therapy and has mentioned putting him back into treatment, but she's hesitant since he wasn't cooperating the first time.
Is there literally anything I can do or should I cut my losses? I don't want to just give up on him. I would like to be helpful in any way I can. I also went through some shit as a kid and needed hospitalization due to it. Only my mother was there for me back then and I felt like everyone hated me, I don't want my brother to feel like that, even if he treats me poorly. He's a kid and I feel there's still hope for him.