I didn't want to impose myself on TwoTeacher's thread as I'm not in the same situation. My father is a toddler in a man's body. Throughout my life he has had his way through violence and bullying, to the point where life is simply not worth having. I have a brother who married very badly, saying that no-one else would want him. He now has a close relationship with the bottom of a glass.
He and his wife have 2 young children together, and I feel desperately sorry for the children. Their mother is paranoid and their father (my brother) is screwed up. My brother takes no responsibility for himself and is his father's son.
In the broader scheme of things, I am well away from this madness. However I am finding it hard to shake off my father's recent threats that I have to be nice to my alcoholic brother or else he will cut me out of his will. He has also told me to be nice to my SIL despite being spat at by her and being told by her that I was a bad mother.
Right now I am sad and angry and feeling pretty crap that I can never do anything right by my father.