I never write about this because, ouch, but abusive siblings… can be a really strong point for losing your sanity? If your parents are abusive you can still kinda find some support with people closer to your own age group and hate on parents together sometimes, but if your siblings think you’re worthless piece of trash and that parents are right to abuse you, that can really make you doubt if there’s anything of importance to your existence, and if everyone is just right about you being useful only to use and torture.
Abuse from siblings is different type of betrayal, because they at least, are supposed to team up with you, recognize that the parents are dangerous and unkind, but sometimes, they get a little more affection, little more importance, little more presents and money and privileges compared to you, and it becomes enough for them to side with parents and join the torture, and they feel pretty justified about it. Even better, the entire family gets to bond and connect over how they all think you’re nothing and that you deserve that to be shoved in your face for every day of your life.
Living with abusive family is a fight for sanity, and having someone else grow up in that same environment as you, but completely denying your point of view, and supporting what your abusers say instead, is downright maddening. And we’re more inclined to trust the opinion of someone who’s in same situation as we are, because they would have the same problems, same fight as we do, except, sometimes they don’t. There’s cases where abuse from siblings can exploit the family system to inflict additional abuse to the family scapegoat, and parents allow it because it supports their view of scapegoat deserving abuse.
If your parents, and siblings were abusive, you were really all on your own, despite having family members, despite being surrounded, probably often against your will, with people related to you, you had no one in your corner, and nobody was looking out for you. You did not deserve to be betrayed in so many ways.