What to do if your half brother is a woman beater and your sheltering (slightly off) mother protects him from getting into trouble for it?

The last person he actually hit was me. It was caught on Camera, because my mother has a Security camera in the living room area to monitor the house while she's away. He randomly attacked me out of anger and slammed me to the ground and started punching me. My older brother (who lives in LA) witness the footage live told me to called the cops. The cops eventually showed up after My mother tried to attack me for calling the cops on her son. When I got back to the house after the cops told me my mother said I attacked my brother and he was defending himself. I told them I have footage, when I went to log into the camera she deleted my log in name. The cops eventually told me My mother and brother make it two against one without the footage, and the fact my mother said I attacked him off camera ( which the incident started on camera smh). The officers and I talked for two hours and they said they believe me and I need to get away from this family. Later I snuck on to my mothers computer and logged in through her account and downloaded the attack footage. She found out and threaten to beat me down If I turn it over to the cops and kick me out. This is my first time back home in Ten years, I try to stay away from my family because they are very negative people, that do very bad things which I do not approve of. Since Ive been back (because of a minor set back and my name is also on paper for being part owner of the house we have), I'm moving back out in a couple of months. But I feel like my brother should pay for what he did. Especially to the women he hurt and me, which took me a while to heal from. I'm pretty much the scapegoat of the family that pretty much does many unlawful things. This is not the first time my mother protected my sibling from the law.

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