Hunny, I'm so sorry. drems can be so confounding, besides being so incredibly terrifying. I hope you get your answer if you really want it. I know that i would, and I'm in the same situation with knowing stuff was done but not knowing who did what or when. I got 6 older brothers, so they are the primary candidates, but which one os ones? I don't know so all i can do is run away.
So i hope you get your answer so that if you feel strong and if you want to, you can point your finger and accuse. Maybe that's not what you want, I just hope you do get to end the dream in a way that gives you some peace. if safe....