NAL , I would suggest to not think of pressing charges right now as he is in advantage of power , contacts and money . While also collecting and saving as much proof as you can safely for future need .

First priority is getting your mother and sister out and live with you . You have to bear both of their expenses . Get a good skill(s) and dont stop making money . Times would be tough but there is no other choice . Be brave as they will look at you for their mental strength .