Ok so I am 16F and my brother is 13. This has been going on for a while, probably for 3 years. Basically he comes into my room most times this happens (but not necessarily, sometimes my parents are there). He has a crazy look in his eyes as he approaches me. Most times he tries to touch me (private parts included) successfully, sometimes he just grabs my legs and simulates penetration. He never raped me in the typical sense yet.
If I try to oppose verbally (like saying "stop", "don't touch me") he just imitates me. If I don't, he continues. Even if I do, he still continues. And I can't stand hearing his voice imitating me as I say those words in pain, so I just...let him do that. He doesn't stop until I threaten to throw actual objects at him, or until my other sibling does. All of this happens at least twice a day.
My parents know he does this but all they do is say "you know incest is a sin?". Like wtf, protect me at least?!
Edit: I forgot to add he is very big, I'm not.