Well lets see

Left me after 20 years for someone who was 20 years younger than himself who is so emotionally immature it untrue.   This is a person who kept txting me to ask me if I thought that he would stay with her.
and reads all his txts and mail and heaven forbid that he should even talk to me

Managed to produce a baby 8 months and three weeks after he left me.

Completely alienated his daughter by

Assuming that she would just come up and see him in the boosum of the new family which to her credit she did but was stumped by her stepmother's behaviour who apparently couldn't cope with the competition for attention.

Making her feel like an after thought in relation to brithdays etc or worse still turning up on the shop floor in Boots with a birthday present after they have had a blazing row, even when I have deliberatly been out so they could meet at the house.

Had a huge row with her at a friend wedding after she had had a row with her boyfriend and needed support.

and so on and so on.

Reading it all sounds quite trivial but you really would have had to be there.   Given up now. I encouraged her to see him and her half brother and made it as easy as possible. They are at a sort of vague stand off.    She says they get on passably if they don't talk about anything important. I say give it a couple of years and see what the situtaion is.