So, will your daughter write her PhD using OW’s nut case?
I agree with others about OW’s H. You don’t need to defend yourself.
I don’t know what is going on in your H’s head, but his behavior is weird. Inviting you inside, so you can all sit together and chat... I admire your strength, but do you think you are giving him a green light to play a happy family? I might be wrong here, and it might actually work to your advantage, where he would see the contrast. Your H is in Lala land with all that OW and her H business.
I applaud your daughter for trying to maintain the contact with her dad, even though that she is not approving what he is doing.
M:50 H:52 S28 (my S from previous marriage) M:17 + 3 BD: 06/12 S: 06/12 - H works in another state