I think it's time to try and work through this, and I'd appreciate some help. I'll try to give as full a story as possible, so this may turn out to be long.
My parents live together, are still married, but they can't stand each other. This has been a problem since I was a child. They have fought, verbally and sometimes physically; they sulk, bitch, and seem to now enjoy hurting each other. It's miserable.
My father was unfaithful when I was growing up. He is the product of an abusive father, and he often follows that same behaviour. As an adult, I can understand this, and I do feel slightly sorry for him. However, my sibling and I were often hit and emotionally beaten down. My parents have written a largely different history - they imagine that their disagreements were nothing to do with us, so we shouldn't have ever been upset by them. Everyone knows this is bollocks, but I think it makes them feel ok about it.
I have my own child with my own husband. He is as different from my father as I could wish for. Next week, my child has a birthday. My mother will be away (another thread of its own - I don't know what she's honestly doing) and my father is sulking about it and is currently ignoring everyone, including me. Ordinarily, I'd let him get on with it, but we will be in the same town over my child's birthday, and it makes me sad that he's too pig-headed and selfish to see us.
I'm considering telling them all to get stuffed. I can manage their idiocies, but I will not have them upsetting my child. I'm disappointed that it's coming to this - they can be nice people, and good grandparents - they are not completely awful. I'd be sad if I never spoke to them again. I'm just fed up of dealing with this selfish and hurtful behaviour, the rewriting of history, and the thirty-something years of fighting.
Of course I've told them this, countless times, but they're selectively deaf to it. I wish they'd just split up, but they seem to have taken co-dependency to the level of an art-form. Nothing I say has any effect on them in the longer-term.
I don't know what I want, I just need to work through it a bit. I don't think there's an easy answer, but I'm increasingly angry with them and I want to think about it carefully before I decide what to do.