Brief (ha!) bit of background:
My mum & dad divorced when I was 4; dad has been in and out of my life, had lots of girlfriends but never settled down, never paid child support, regularly let me & my brother down over visits, holidays, etc. and several times whilst growing up we said we didn't want to see him anymore. As an adult I've always known that he's quite useless & just made my peace with seeing him maybe once a year at most.
Two years ago he was promoted & moved to Germany for the job. He met a new girlfriend there & by all accounts they make a good couple (I've never met her but they've been together about 18 months). Since this relationship started, I've heard even less from my dad and contact has consisted of a brief email once a month or so.
In July, he forgot my dc2's 6th birthday. I emailed him with an admittedly passive aggressive "Hi, how are you? We had a lovely weekend with *** for his birthday. Here are some photos." and he replied with a huge apology, saying that his laptop had just been repaired & he'd lost all his calendars & birthday reminders. I let it go & accepted what he said.
Last week was my eldest's 8th birthday. No card, phone call, email or any form of contact from my Dad again. I assume he has forgotten this too. I emailed him on Sunday night with another PA, chatty summary of what we did and a round of photos, but this time there's no reply. I get a read receipt when the email has been opened, so I know he's seen it.
WWYD? If it was my birthday, I'd shrug it off & not think twice (I got a Moonpig card for mine two weeks after dc2's forgotten 6th birthday btw), but these are his grandchildren & they deserve a grandfather who remembers their birthdays, right? I suspect that if I properly challenged him on this, he'd get very angry & defensive and we would just fall out, perhaps irreparably this time. He's not the sort to take criticism on board & change his behaviour, not where family is concerned.
Should I just ignore it & accept that he's as terrible a grandfather as he was a father?