I've just read the whole thread, trying not to let it melt my hard heart. Thankfully, I think my crying days over my df are over.
He married again 11years after cheating on my DM. (Not the ow) I was an adult (26), so I was spared any mistreatment as a child.
They married within a year but I was invited. She did the trick of being nice before the ring was on, and then to be fair, she mustered up indifference, rather than mean, spitefulness.
I used to see my dad about 3 times a week. He took me for my shopping on Friday's, as I didn't drive, and he gave me driving lessons. He was also a big fan of the gym, as am I, so we would go once/ twice a week together.
I was a competitive swimmer as a child and it was my dad, who did the majority of the running me about to training 6 times a week, and competitions, all over the north of England.
We were really close.
Then, all of a sudden when I went to visit him, she would stay in the kitchen, or upstairs. I had a newborn at 26, I could be there for over an hour and she wouldn't say hello, or goodbye. It was bizarre. (Although, not so much now I have read such similar stories)
I gave up eventually. I don't go at all anymore. He comes here for all our birthdays, to give Christmas presents and Easter eggs. So, 7 times a year basically. I'm indifferent if he didn't bother. My eldest dd (15) doesn't love him at all ("how can I, I don't know him) .
She has 3 children who are adult now, but were young 9-13, when they met. He has loads of photo's on his phone of their babies, he takes great delight in showing me. I just mutter and placate, and act totally disinterested. Either that, or cause a scene and feel forever shit. (My df is very good at playing the wounded solider)
He also spends a lot of time with his eldest DSD. So much so, that his wife (her own mother) has said " why don't you go and fuck her" classy I think he likes to spend time with DSD, because she shines brightly in her eyes with love and respect and admiration for him. I expect, despite my civility and polite (not at all stilted though) conversation, my eyes reflect disappointment and a distinct lack of respect.
He once let his guard down when he was drunk and told me, that he wasn't sure what I had done to upset his wife (she is not my stepmum) but she doesn't like me. I recently brought up the fact that she hid when I visited, and he tried to say, she was just giving me time to spend with him. 
I last saw her on my 40th, I'll be 42 soon. I last saw him at Christmas. I was out when he came around with the Easter eggs. Next dc's birthday is August, so I expect to see him then.
We are the same with regards to dp's df and wife. (Neither dp, myself or his 2 siblings were invited to the wedding) The dc's do not know him at all. Also with a 6th birthday and a 5th birthday coming this year, they have yet to acknowledge that they have a day that they were born on....
She fields all calls. We call her the gatekeeper. All 3 siblings get texts and phone calls from her, not their df. She sends messages trying to facilitate meetings and tells the younger 2 siblings off, for not spending any time with their df!
She wouldn't dare do that to my dp. (10/11 years older than siblings) but she hasnt invited him for a boxing day meal 2 years on a row now. Someone must have said something this year though because we got a- sorry I didn't mean to not invite you, I just didn't think you'd want to come because of the kids- text.
We haven't replied.
She has no kids. Im pretty sure she doesn't actually like them, or understand them.
Except she fawns over her niece (tried to set her up with my dp, despite having met me) and her baby. Had all her family at the end of the table for the boxing day meal, and put the 2 siblings right at the far end, away from their df.
Weak, weak men.