I'm sorry about the parental alienation you and your children have suffered, that's terrible for everyone.
Not even my own father cares. He happily continues to see his grandkids because he doesn't want to "take sides."
I'm confused why you wouldn't want him to see them. Isn't in your best interest to have people who love you and think you're a good dad in your kids' lives? Somebody to counter the alienating narrative in whatever ways they can?
๐