I agree, I have less than zero sympathy for these, or any low-life piece of trash that imposes such choices upon their children.
Granted, sometimes marriages don't work out. But for Pete's sake, you stay together for the sake of the children. I wish people would stop feeling like "they" are the most important people on earth, and simply, grow up.
BTW, I'm very glad you've been able to recover. And I, as you, wish you could help your sisters, whether they want it or not. All we can do is pray, right?