My brother is a few years younger than me and in middle school. I won't say his exact age but he is in middle school. I am in high school. My brother is a very violent person with little to no regard of personal space. He will constantly ask me to go to the trampoline and will beat me up when I try to leave. I am 5 feet 4 inches tall and he is 4 feet 10 inches and I try not fight back since I don't want to hurt him. Tonight was one of the worst fights. He hit me in the hand and jaw really hard and I got bad bruises. He also plays on his PC everyday for like 7 hours and barely eats or sleeps. He will also throw really bad tantrums over the littlest things. Our mom will sometimes hit us or yell really badly and call us names. What can I do to prevent him getting hurt or hurting others?