Be glad that you have a chance to repair the damage . My situation is the worse.. I didn't get a chance to repair anything. I have complex PTSD from my children's father and the alienation he caused. They are grown now and I'd always hoped there would be some improvement, but no. He actually still continues in every way possible. Subtle,. but they are already programed. The thing is if you ask either of them for just one particular example of something I've done, they have no answer. But very abused children love their parents. He also managed to estrange my mother and I over a few years . I could write a book on how he manipulates.. it is horrendous.