It's a difficult post op.
DH and I are early 60s and still working full-time. Our DC are mid to late 20s. We chose to work without the need to. Our mothers are mid/late 80s, my step is 80ish. For context some of their views:
Anti-refugee (how mother puts up with that I shall never know as her father and first husband were refugees).
Homophobic
Think foreignors are scroungers/the bane of this country.
Pretty sexist re: pink, blue, jobs, hobbies, what women are capable of.
Neuro-diversity is largely made up and excuse for being thick, ditto those with depression need to pull themselves together.
I try to temper it contextually in that (except mother) they are small town, small minded folk whose views were shaped in a different era. I treat them with a pinch of salt because despite what comes out of their mouths, mostly steps, in reality, if he saw someone vulnerable being beaten up, he'd wade in regardless of colour, creed, etc. Similarly if someone at the supermarket had to put stuff back, particularly a mother, he'd sort out their bill.
Their formative normal was a world of "no blacks, no dogs, no Irish", alongside Rachman, Love Thy Neighbour and an entirely different "normal" world view. They aren't bad people, but their mouths haven't caught up with the 21st Century.
My DC, however, cannot excuse them having been brought up in a different world from me even.
Regarding the drinking, they open a bottle of wine at 4pm and step breaks into the 2nd by about 6pm. They are heavy drinkers but not functional alcoholics. They don't drink and drive.
Regarding childcare, I got none when DC were small although my side was good, having them in the holidays for a week when I went back to.work. The DC decided they didn't want to go from about 12 because they couldn't stick them. DS has a good relationship with them. DD avoids.
As a 60 plus woman with plenty of money, who is likely to have gc in the next few years, I will not be committing to childcare on a regular basis. I will help in emergencies and we may fund a day of nursery. You are not entitled to free childcare from grandparents and Whilst I am fit and work full-time still, I don't think I could cope with the physicalities of tiniest on a regular basis.
Are you perhaps conflating your resentment over childcare and their wealth with your perception of their behaviour? You post was sad and bitter in equal measure.