Stepbrother with Harassment Order Moving Back In

trigger warning/DV I'm really distraught right now. I just found out my stepbrother (who my mother has a harrasment order against for threatening our lives, destruction of our property, intimidation etc) is moving back in on the first floor with the landlord who is his father and also my stepdad. its a mess. we live on the second floor. he has explosive anger problems and blames EVERYTHING on us. he moved out about 6 months ago, but isn't getting along with his girlfriend so he is moving back in. the order we have only says for him to stay 5 yards from our apartment. the entire neighborhood is sick of him because he literally harassed everyone with violence and disruption. I feel so scared. we ask my stepfather to step in sometimes, but his son beats him up and he then is too afraid to help us. I don't know what my next step is.