My shitty family

Me (17F) and my sister (20F) went through a lot because of my family. But we dont really try to do anything dispite it being so horrible.

So this happened around the time I was 7 or 8 years old. My cousin who lived with us for education purposes (he was with us for 2 years and then returned abroad to his family). He took me to the washroom and did smthing to me I still can't recall properly. I forgot abt it until recently my sister shared her horrible experience with him. He made a fucking 10 year give him a hand job. He's 10 years older than me for context. It would be best to tell our parents abt it right? Nope theyre no better.

My dad is worse than that. On the pretense of massages, he would rub himself on me and my sister. He would openly try to harass us in public and in front of our mom (he tries to "jokingly" touch our ukw). My mom laughs it off. My sister tried to tell my mom abt the rubbing back when she was around 13. My mom screamt at her for accusing our father of smth like this. She called us ungrateful and good for nothing bla bla bla.

My mom is atleast better right? Nope. She abuses us emotionally. Ok for context, me and my sister are ideal daughters. Top exams, don't do drugs, no bfs, wait I forgot to mention we're muslim. Well I don't believe in a god but they might just kill me if I say this, extremely religious family. I'm not allowed to remove my hijab. Anyways, so my mom thinks of me and my sister as achievements to show off to others. She tells us we're useless and worst daughters ever. I have 2 younger siblings (11F and 5M) she makes us take care of them As well. We arent allowed to go out smtimes cuz we gotta take care of them.

It might sound like I'm venting ( i am lol) but i really dont know what to do.