daughter - what a terrible position for your parents to put you in. Unfair and inappropriate. My exBPDfriend did the same thing, stating that I was the only one who could handle the difficult people in her circle, and even got me to volunteer for a group she was in, as a way to get me in her intimate space and connected to her.
When I went no contact with my exBPDfriend, I continued to be the scapegoat for months, even in my absence. Everything that went wrong in her life, was because of something I had done. I wasn't even there anymore, and I was still the problem. Our mutual friends would let it slip regularly about what she was saying about me.
She had done the same thing with someone before me. And when I could no longer be blamed, because she was making new mistakes with new people who had nothing to do with me, she found new a new scapegoat.
As far as I know, she's still doing it, going through groups of friends, burning bridges as she goes.
For family, my mom had multiple scapegoats, and rotated through them depending on what the problem was. First it was my brother, then me, then my dad, then my aunts, then my grandma, then me again, then her husband.
Granted, each of us made some bad decisions here and there. None of us were saints. In fact, my grandmother was very abusive to my mom her entire childhood. But my mom needed to have a scapegoat whenever anything went wrong. So she cycled through people to blame.
Me not being around made it less likely to be the scapegoat, although, she used me not being around to explain some of her problems, too. So I could be a scapegoat even when I wasn't even around to do anything wrong. I did things wrong even when I wasn't there.