What to do if I have abusive father

My father is so abusive towards me ,my mom and my siblings . He never treats us well but he treat well to his sisters and their children no matter how much they insult him. He always uses abusive words for me , my mom and my siblings .He doesn't want to pay our bills like education, electricity and gas . He doesn't give money to bring groceries properly . He used to beat my mom so vigorously , like choking , beating her with a long sticks and various things . He never treats my mom like a wife , he says she is a prostitute . He taunts me for not earning money but I have just turned 18 how can I earn money ?he says I should do all the household chores because I am a girl . I can't even laugh infront of him , he says you and your mother keep laughing whole day without any reasons . He never allow my mom to talk anyone , if she does he gets abusive and starts violence . He never allow us to make friends either . He never takes to trip and tours in vacations. He just keep harrassing us . I don't want him in my life anymore.