well, you certainly stirred the hornets' nest, and maybe some replies are harsh but.
You have a responsible city job. You have children. Did you assume that they would remain babies forever, or when planning a family did you think a bit forward about what your (as a family) needs would be and how they would change as the DCs got older? (many of my friends didn't and were a bit shocked when plans suddenly didn't work any more because they had outgrown the situation)
I have never been the best mum in the world, but one thing we always did as a family was have a regular review - Oursurname Day was at least an annual thing, as the DCs grew up it involved a lot of Drunk Uno and so on - of what we were doing, where we were at, if it still suited us etc etc. It would involve things like: getting a mobile phone when they started secondary and not before, if they could invite friends over after school if we weren't there, if they could go out after school before coming home, changes to pocket money, changes to family responsibilities (who did the bins etc), when my job moved, how we would make sure to eat together at least 3 nights a week even though i had a hideous commute, when i studied on the OU what i was prepared to sacrifice etc etc etc
and you need to do the same thing with childcare, especially when it is elderly parents. now I've hit 60 i have really noticed some things that had been creeping up, that i had half an eye on, now need a whole eye and adjustments to what i take on. etc etc. So, yes, it's a bit of a shock, but surely it can't be a surprise that elderly people find growing children tiring?