Little nightmares
Doing someone a favor (even if you’re paid nominally for it) is just that, a favor and not something to be expected. Looking after someone’s children is a big ask, and not always what you want to spend your time doing, even if they are little angels.
If the children in question are less than well-behaved, then you definitely don’t want to get involved. Reading how the children in question behaved, I would definitely not be babysitting again, and I’m a very patient person!