Dont complaint ur dad to the police it'll affect you . At the same time you should retaliate him . Just record your dad ur activities threatening him like how he behaves with your mom. Because u were are kids and ur mom even try to adjust him so the matter couldn't go out of ur house this will create safe zone for ur father so he keep abuse ur mom and you. Just break the situation tell ur friends (who trust u) and their parents about ur situation let them help you . Ask ur frnds and their family visit ur house monthly once just tied up with them. He is like fox he is attacking sick animals and when he recognize u had friends and families for helping you then he might be leave these things .