Break free from your birth family.

[Sanity Claws]

Learning when to say no and walk away is a valuable lesson. I saw earlier in this thread that you want them to say that they are sorry. You aren't going to ever hear it from them, at least not while you continue to obey them and give them reason to think they are right.
In hindsight years later they might be sorry and regret their actions but you are not going to hear it while you still engage with them.
Remember your well-being is not conditioned on the actions of anyone else. Take care of yourself.

BTW, I broke free from my birth family. Their behavior was not as horrific as what you experienced but I knew I was not valued or wanted. The only regret is that I didn't do it earlier.

Good luck to you.