If the youngest D doesn't want to see her dad, then you tell him that. You can't keep playing the polite parent. He damaged his R with them, it's not your job to fix the broken bridges. It's his.
He also has to live with the consequences of his actions. If he doesn't start suffering any consequences, he will continue to do what he's going to do, especially since you've been very "accomodating".
M-43 W-40 2D - 9 and 5
Emotion, yet peace. Ignorance, yet knowledge. Passion, yet serenity. Chaos, yet harmony. Death, yet a new life.