I came to peace with my relationship with my Dad over quite a long time, and would say I spent a lot of time crying over it, fighting, etc.
I think in the end I essentially grieved for the relationship I had expected/father I thought I had, then went forward from there.
The toxic parents book they recommend on the stately homes threads is good too, quite enlightening - I have lurked on there but it is quite established and don't want to barge in
Fighting the urge/need to get their approval is one of the hardest things I think. And other people can find it hard to understand just why they are 'difficult'.
I got to a stage where I thought, I would not tolerate any other adult speaking to me like a piece of shit, and I should be able to expect better from my parent. It is quite lonely though, when the one person who should love you unconditionally cannot.
I still have an occasional thought to ring with news, eg DC started walking today, got a first tooth, whatever. But then if they cared about the DCs, they might phone occasionally and ask after them? So I tell someone else instead, someone who gives a shit
I still maintain it's your wedding though, don't give her the opportunity to taint it. You have made your own family