My daughter feels that way about her father, too. He is very ill. She doesn't care, won't talk about him, and if I accidentally say something about him, she gets angry. She will literally not do anything to help him out. He came over to our house once, dropped off by a friend. She didn't want to let him in, even though he can't stand for very long. She refused to give him a ride home, and he had to call a taxi. That cost $60 because it came from pretty far away ... we don't have taxis in our town. I was unable to drive at the time.
She thinks he is a horrible person, and extremely abusive. Well, he isn't ... he just disagrees with her on some things like politics, social issues. He's not perfect, but three of my kids refuse to have anything to do with him. They all see people in black and white, no gray areas.