"My dad basically said, your wife has problems, get a divorce and make a fresh start. My sister is mailing me all sorts of stuff on father's rights, etc"
Sometimes family see thing clearly.
You do know that this woman isn't your friend now don't you? Friends don't hurt each other on purpose. They just don't. She wants to divorce you, take your home, your kids, and most of your income. She wants to do this and she wants you to cooperate and help her rape you. Don't do this.
I'm sure you know, but divorce is terrible for kids. This certainly isn't in there interest. Kids don't care if their parents are happy, they want their family together. Perhaps get a copy of The Unexpected Legacy of Divorce by Judith Wallerstein and read it. Perhps she will too. Probably not though.
You do have a lawyer don't you?
I'm a man . . . But I can change . . . If I have to . . . I guess . . .