My brother threatened me by slamming a wooden chair down onto the ground, partially breaking the chair. Then a few moments later he tore the chair in half with his hands. When this happened, the chair leg stabbed my mom in the arm bruising it. My mom will not let me call the cops to report this, and she will most likely not cooperate with the cops if I call them. My brother has a history of violence from threatening to break my sister's neck to punching holes into the wall. He made a lot of verbal threats but has not hurt anyone so far...until today. Is it possible to call the police to have this case documented, and later decide on if we want to press charges? Thanks.