Thank you for all of your replies.
I think the park thing was probably a more emotionally driven thing because at the time of posting, I had already unpacked and cleaned an exploding bin and dealt with various fights so was looking around the place feeling angry and yes maybe a bit entitled to some degree in my expectation for grandad to save the day.
he’s the kind of grandad that when he’s here, he’s so great. He was a very hands on dad according to MIL, but he did have an affair… and they split and then things went a bit downhill.
he’s quite uninvolved in his DC lives, one who is frequently bringing problems to DMIL doorstep, illegal things which I won’t elaborate on, grandad doesn’t get involved. Which is painful to see.
hes just a tough one to workout, he will go literal weeks without seeing grandchildren but when he’s with them, you couldn’t ask for a more hands on person. Like I said, when my DH was young, he did loads with all the kids, and was very involved.
his home life isn’t great but he has already moved on, so whilst I felt great empathy for him, I know he’s a lot happier now.
I have learnt from this post that grandparents aren’t always willing/ able/ whatever you want to call it, to spend time with DGC. I’m surprised, maybe because I’ve been spoilt with my MIL, and my dad to an extent who have always been huge pillars of support in our lives, maybe (quite possibly) something I’ve taken for granted in the past!