Family problems

Me, my husband and son live with his dad until Feb. His brother is extremely mean, he hits me and punches me. He wrapped one of my son's toys up and started swinging it at me, he takes my son's toys and gives it to his dog to chew on..he wasn't living here when I moved in but he recently needed to come home. He claims he's just playing around but I have bruises.. he is older then me. We have talked to him about it..he doesnt stop. He calls me fat and tells me I need to clean up after him and his dog (who throws up everywhere) as well as my husband and my son because im the only one who stays home with the baby. He does the same thing to his own father! Who is about be 53years old. What do I do?