PILs are dead, never knew our children or me.
My mother was a wonderful grandmother, very hands on in a helpful way. Adores both my dcs and my dh. Older now with health issues so roles have switched, I help her, my kids help her and do visits. We have a close bond now but I had a horrendous childhood, lets say she's a much better gran than she was a mother.
My father, well he was never around much growing up, they divorced and my mother fell apart so I supported her. My father never forgave me for doing that even though it was natural as she had supported me with the kids from day one. Never bothered with birthdays for me or my kids, did for my sibling and their children. Remarried and now has step-grandkids who via the odd look on facebook he seemingly adores spending time with.
He rang me once to berate me for being a terrible daughter, I laughed at him and told him he'd been an awful father who made zero effort so why should I do all the running.
It used to hurt that he didn't bother about my kids but I know 100% mine are better off away from him and his narc tendencies.
Mine haven't missed out on a grandfather, they had wonderful great grandparents who doted on them, my BIL loves the bones of them and they him and they get on with their cousins on dh's side.
My father can reap what he sowed.