Background: 2 of DH's sisters have daughters in the same class as DS. They and their husbands all work full time; I work part-time (DH full time). I can set my own hours, up to a point, so I can do drop-offs and pick ups for DS.
The cousins go to day care each afternoon- they are picked up by the daycare place from preschool. I fairly regularly mind them, though, on random preschool days off, or if one of them is ill etc.
So the dilemma: Preschool has a "Play With Me" day coming up - basically, at pick-up time you stay with your child and do an activity for half an hour. This one is pottery painting, and DS is really excited about it - he wants to make a present for my dad's birthday and has it all planned out.
DNeices' daycare have said they can pick them up half an hour late, but obviously the preschool need someone to stay while they do the activity. SILs have been hinting that I can supervise them, and telling me how much their daughters want to do it.
I just don't want to be responsible for 3 of them, though. It will mean I won't have as much time to help DS; at previous sessions it has been really good 1-on-1 time with him, and he's been excited to show me round his classroom, and all the displays etc. I want to have that this time as well, and I wouldn't get it if I'm helping 3 of them.
AIBU to say no to also supervising the other two? I know they want to do it, but I feel like that's not my problem. Any of their parents could take a half day to come, if they wanted to, but they've all chosen not to.