Should I testify against him?

Ok I don’t know how to start this off so ima just say, I have these two girl cousins who I’m really close with because we’re the only girls in each littler family, with all of us having 4- 10 older brothers. But when all of us we’re 5,6,7, and 8 we were all getting raped and molested by one of are cousin’s, who is 6 years older then us, he’d do it with all of us I the room to. We all were told to keep quiet by him, no one knew this was happening until just recently because we all made a pack together to not tell anyone. But now that we’re 16 we still always kept quiet about this, but one of my cousins told her school counselor about why she was having nightmares and what they were about. Two detectives came to her door asking her door asking about the whole thing and said that she could press charges against him if she wanted to, she’s open to press charges and testify against him because she feels like he really scarred us and he did😞, my other cousin is upset because it’s her brother who’s the rapist and doesn’t wanna even talk to us since we brought up the court thing, I personally just wanna forget it happened and pretend it didn’t happen but I keep having nightmares and I’m ashamed. But she’s begging me to testify against him with her and take a lie detector test but it was so long ago and I don’t wanna put someone else in jail, even though he took a big part of my childhood away from me I really want to move on and not even bring it up with a counselor. But I’m afraid if i I don’t something will happen to someone else and it all be my fault and my family will disown me for putting one of them in prison. I told my mom and she said “it’s not that big of a deal it was so long ago I kinda had a feeling something like that was going on” so I don’t know what to do because I’m also terrified to have to talk about something like this especially in front of a crowd........... what should I do???

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