Been questioning myself all day. Am on mat leave at the moment, but MIL still wants to look after DS once a fortnight (she had him once a week when I was at work). She picked him up this morning announcing she was taking him to the wacky warehouse and asked if I had the little purse for her (we usually put a few pounds in since she looked after DS as a favour while I was at work). I said no and asked what she needed it for. She said that she needed the money to get into the wacky warehouse. I asked if she could pay as things are tight as DH had been out of work for 2 months (ok, I could have stretched to £2.50, but it's the principal). If I was looking after DS (which I have no objection to) we certainly wouldn't be going there today! The park or library is free! AIBU?