Even their respective children never get a chance to meet. We have never even mentioned the fact to our eldest son that we have a beautiful new great grandson this year. I do not believe he nor his wife would be interested in the news
Thats really sad, in fact all of it is, and Im so sorry this is the way it is for you.
I have a lot of children and two of my boys quite otften fall out. I dont even try to sort it anymore. Its just who they are.
I dont let it make any difference to family and I make sure all of their children know each other and are part of the cousin gang. I have them at my house, I take them all out together, and I take them to each others homes. They're dads can behave how they like but its not going to drive a wedge between the next generation. No one stops me doing what I do and my sons love their siblings children. Currently my sons are on reasonable terms but if they weren't they would both still be invited for Christmas gathering. If they chose not to attend thats fine, but their children not being here is non-negotiable.
Children born when they're not speaking to each other? They're interested and always see the baby even if its when their sibling is at work.
Floria perhaps its time to stop pussying footing around them and say its children only for the time being and without sounding nasty - you two can just get on with it.