Quoting Regina George:" I pay people even when they say they don't want the money. If they offer to take her on their own I will ... [snip!] ... with my husband so she was our choice to bring into this world. We are not entitled to free care by anyone (even our parents.) "
You don't think they find that offensive? My family (grandparents) would be HIGHLY offended for me to try and force them to take money.
Of course, they watch the kids very rarely, far less then I think they'd probably like to. But paying a grandmother who wants to spend time with her grandkids? Shoot, I'd find that offensive.
I agree to the "not entitled" thing, but when people want to watch the kids for free?