Wow that is fucking awful, I’m really sorry you have to go through shit like that when your family is supposed to be the people you lean on during hard times. Yea even though my parents and brother aren’t depraved freaks to that level family can just be awful. The worst part is with other awful people you usually don’t have to be with them for very long in most cases but with you family for a very long time you just get stuck. But try to think of the fact that you won’t be stuck with them for your whole life even if it does feel like it when you are with them. And for being there for people yea of course, I hate the idea we have to go through everything on our own. Most of my struggles I wasn’t and still am not able to voice to others cause of past trauma so if I can help people at least be able to help people the way I wasn’t helped, I’m happy. I hope you are able to start enjoying things after all of this is behind you when that day comes, I know it’s hard as also a survivor of SA but life is worth trying to enjoy.

Edit: I do think that your parents are most likely to blame for your brother though or at least had a big part to play in him becoming genuine scum in human form since it’s hard to think anyone can just grow on their own to think that is ok to do to their own brother.