Not everone believes the adult. I am so sorry you are being abused. But just because you are taking taking this abuse does not mean that your siblings are not being harmed. I kow this because I am the oldest and had those thoughts and hopes. But that is not the way it works. The others may not tell you what is going on.

Doing the right thing for yourself and your siblings may also be the hardest thing in your life... but the right thing is to tell your principal or another person in authority the truth.

My heart goes out to you.