Welcome clover to PC Forum... i would get a hold of a school counselor and tell them you feel unsafe in your home environment due to the excessive threats and violence you feel in your home. Then tell them about your brother. The state will remove you from your home and put you in state custody. Now you run the risk of being placed in a foster home much worse than the one you are in. Ask for help reliving trauma and they will get you the counseling you need asap. If you feel unsafe you need to talk to a counselor now... before things get way out of hand and some one gets hurt or harmed ..