Help about mother's boyfriend

For the past three years, my mom had gotten this boyfriend and she really liked him, so she began to start to treat him a little bit better; to trust him. Youknow, bc he can give her things my sister and I can't, and because we where 11 and 12 But one night he came into our room ( My sister and I share rooms) while my mom had left to go get something for them to drink bc he stayed with us, and I woke up when I heard him. I saw him and tried to scream but he forced a pillow over my mouth and r*ped me. I couldn't do anything bc he's like huge with muscles, and I started crying but he punched me and I fell out. When I woke up, my sister was crying too and she said he did the same to her. He's done this almost every day when my mom goes to work or to the store because he decided to get a night-shift job. I told my mom, but she said we were lying and we got in trouble, and now my sister is pregnant bc he usually (otherthan the first time) uses protection and she told my mom but my mom called her a slut and a wh*re and said she would disown her. What do I do?

phone childline