Father is troubling my mother financially

My father does not provide enough money to my mother for her expenses. He's rich and earns more than enough money. Also since the day I have started working he hasn't provide me a penny instead asks me of my money and wants all my money. I do not want to give him my money. He I'll treats my mom and probably suffers from an undiagnosed mental health issue. He thinks my mom wants to kill him and has been poisoning him since last 10 years. He has been going around the city telling everyone the same. We belong to Muslim religion but my parents had a inter religion marriage which means they have done a court marriage. Please help what steps to take to protect me and my mother.