Mine don't have at all to do with GC and it's sad. I reminisced on the post about parents helping their siblings, about how when we were growing up we were either at one GP or the others or out somewhere. We should stay over at weekends, in fact I know one GP picked us up from school and did child care if necessary.
My Mother didn't work, she just put herself and her needs first, as a young Mum, or to go further as younger parents, they weren't going to let 2 children get in the way of their social lives.
I think it has been instrumental in how things are with my ex as we parented 24/7 - 365 days a year. Apart from working then we had to pay for nurseries. The one time we wanted to go, it was the first time in so long, we had tickets to see a group we liked, my Mother pulled out at the last minute. She had no reason, I don't believe she was doing anything, they loved the phrase, you enjoyed, you look after, which is rubbish as I had fertility treatment, there's nothing enjoyable about being infertile.
I've had the same when I've had to pick up the children, on the odd occasion they've been looked after for a few hours after school, as soon as I pull up the children are there with Grandparent in tow, ushering them into the car. The cup of tea I was gasping for would have to wait.
The saddest thing is they feel totally justified, people will come on here saying why should we have to provide free childcare? Maybe because you did bugger all parenting yourselves. There was the whole community spirit thing where you'd go round your mates parents, or one of your parents friends, playing with children of all ages.
You could say well you lot choose to chat via social media instead of in person. But life isn't the same as it used to be. You see threads on here about CF as a friend with children overstayed their welcome. Oh no the OP had to make 2 more sandwiches and a brew for Mum. That was standard stuff when we were young, you were round somewhere near tea, quite often you'd be invited to stay.
I think you're best off NC as they sound more trouble than they're worth, they really do. It's their loss not yours. I'm NC with my Mother who has me blocked on FB but she'll still post something gushing on my birthday, just so her friends can say, you don't look old enough to have a DC that old 
No other reason.