i agree with you that you need to look at the parents in sibling sexual abuse. Usually it occurs either because it's being done to them or neglect, or children being put into parental roles at a young age. I'm having the same issue but on the other side. It's not taken as serious because I was sexually abused by my brother for 4 years starting at 6 years old. He is 6 years older then me. And because he was a kid it's not as bad. Even exoeriencing this after reading your story I completely believe that you were not at fault. I have a nephew who is 10 and he is just learning what sex is and what's appropriate or not. I also though have a niece that is 12 and she is completely aware of what sex is, what's right or wrong. I do think age is a big factor. Children explore. Children learn from what's happening to them. It's normal. It wasn't that way for me. maybe in the beginning but it became more violent, more threats. And he was 6 feet 2 inches tall by the end. To me that is an adult. I believe every situation is different and you need to believe in yourself that you know what happened was not your fault and not give too much power to other people. I get it though it's really hard to block it out when you keep reading stuff that you are a bad person. Just know that it's not true. I'm happy that you were able to express yourself here and to be heard.