My father is a male chauvinist and he's egoistic and we can't deny what ever he says. We are a lower

My father is a male chauvinist and he's egoistic and we can't deny what ever he says. We are a lower middle class family. My father doesn't want any responsibilities and He's completely narcissistic and asked my mother to leave him and their daughter and son(me) ( we have witness for this statement he said ) with her as he don't want to take care of them. So we shifted for peace and he himself told he won't search for us neither trouble us anymore. But recently he started troubling us by calling and blackmailing us to send the address. We don't want to share. And now he's blackmailing mom that he'll go to her work place and ask for address. He never left us to live in peace and joy. We've always been suppressed and harassed. Now we want to get rid off him as we want to live our lives in peace. Kindly help Me(son) , Mom and my sister (daughter) justice. Please. We badly want to end this trauma and begin out lives fresh without anyone suppressing or harrassing us.