MIL reminds me of my parents. They are taking the DC out for the day tomorrow. The conversation to enable this to happen went like this
DParents - let us know if we can help with the DC over the Easter hols
Me - thanks but we've got it covered
DParents - oh, but I'm sure it would be helpful if we could have them for one day?
Me - well, we do have something arranged, but you could have them on Tuesday if you wanted to take them out?
DParents - that would be lovely
The thing is this is not helpful to us - it requires DH to shuffle his work hours to start later because the DParents don't want the DC till 10am, then I have to drive an hour round trip to pick them up at the end of the day. It would be much simpler and easier (and the DC don't care either way) to book them into holiday club. But I agreed to the day because I know my parents want to have them, and I accept that it's probably good for the DC to spends time with their GPs.
But for months, probably years afterwards, my parents will go on and on about all they do for us and how helpful they are. They wouldn't ever just ask to take the DC out because "that would be imposing".