Thanks Amanda, no I won't watch it, though I have to admit to being intrigued now. My family sounds so like the one in the film, though as I say swapped. My mother being the controlling one with mental health issues, my father codependent. I was the eldest, responsible for keeping my mother placated, my brother younger by a few years was/is the Golden Child (and Baby) who could do no wrong. So I had to be Scapegoat among many other roles.
Yes, it was a revelation discovering the Family Systems - I think I knew I was starting to heal when I began to find it all fascinating to dig into!