For context, I, 18F was abused by my oldest brother M27 when I was very young. I have 3 brother and he is my only half brother. He was always aggressive and had anger issues but he would only take them out on me. I told my parents, eventually. My mother never believed me, and my father did. (they have been divorced since I was around 3) I went back and forth from my mom and dads house but when I first opened up to my dad about it he decided to keep me at his for my safety. Unfortunately, he has BPD and soon after, he had a manic episode so I was forced to go back to my mother's house. Of course, the abuse continued. When my dad was finally better he pressed charges and my mother got in trouble. Not too much but enough for the abuse to stop. I still went to each house half and half, but eventually my oldest brother moved out.

To the point, I'm now 18 and I'm graduating soon. My mom is married to a new man and me and my 2 brothers live in his house. A couple weeks ago my mom and I were cooking dinner and she mentioned that my oldest brother got a new job at an amusement park and he got everyone tickets, except for me. I wouldn't have gone either way but it was kind of like damn. I kind of laughed it off thinking she was telling me as a way to make fun, because I didn't think she would go. But she did. The next day she and my brothers went. I felt so conflicted. I understand he is her son but it really hurts that she knows what he did and she still talks to him. My stepdad stayed home out of respect for me. My mom even gave me some money, which just shows she feels guilty. Anyway, long story short, they keep going back and hanging out with him. I mentioned how this bothered me to my other brother and he said something along the line of "you're kind of overreacting" and that "it was a long time ago." Which is true, but I still feel sort of betrayed by it. My dad is currently having another manic episode, so I'm stuck here listening to everyone talk about how good my oldest brother is doing now. I know people can change but it's just hard to think like that when its something like this. AITA?