Just trying to get my head around this. My remaining nan and grandad are in their mid 80s, live comfortably, generally in good health. They retired 2 hours away when I was 7 (I'm now mid 30s). Their contact with me and my sister since then has been sending birthday/Christmas cards each year with 'Happy Birthday/Christmas, love N&G.' They've never called, messaged or visited us once (they're very capable and tech savvy). They know absolutely nothing about us, other than what our jobs are and where we live. They genuinely never ask anything about our lives.
Yet they've always been volunteering with kids and young people in their local community. We just went to visit them for the first time in a year or so. They seem to know all the ins and outs of the lives of various young people's lives - they're hosting a Christmas lunch for the Scout group they used to run this weekend. My grandad was telling me all about an ex-Scout who is now at Oxford uni and how proud they are of him, as if they are part of the reason he's there?! Nan is also furiously knitting jumpers and socks for the new baby of their neighbour's kid, who they've known since he was born. Aibu to be angry about why did they/do they want nothing to do with their own grandkids? It's baffling. For context, my dad is their only child and they treated him poorly growing up.