When it comes to the people telling you to write your sister off - that's stupid. Sorry, but it is. She has a survival instinct too. She doesn't want to get the shit beat out of her. She knows that even if she did say something, it would make the situation worse. It did for my family. I begged my sister not to intervene, because I knew better. Instead of it being me, it would become both of us, and it would just anger him more.

Your mom, though? Toxic. Do not trust her. She is enabling this behaviour. You are her child. This is not okay. She is just as much to blame. It took me a long time to realize just how angry I was at my enabling father. No, he never hit me, but he might as well have.

Get yourself out of there asap. Spend as little time at home as you can. Sometimes one report doesn't do it; again, speaking from experience. Prepare yourself for the worst. Find a shelter or a friend you can stay with, but get out of there. You are in danger and you are being traumatized. You are being told your feelings are something to look down on, something that can't be trusted, and you are being taught that this is normal. It's not.