I'm after some good advice:
DDs birthday party is on Saturday. She has requested a small party at home and picked a small group of 8 friends. As it is such a manageable number we've gone to town on planning stuff to do which is a bit special and requiring a bit of adult help and supervision. And specialist kit, ordered weeks ago at some expense. Whereas I have got enough stuff for all the original invitees, including someone who hasn't yet RSVPd ( fine by me ), what I hadn't accounted for was the 2 younger siblings of the other guests who, it seems, are also planning on tagging along. Each invite named one of DD's friends, no mention of siblings. They're not babies, just in the year below at school, so will definitely expect to participate in the activites we are doing. But as I said, I just haven't ordered enough equipment for any extras, and there is no way I can lay my hands on extra kits before Saturday. Whereas I haven't actually had official confirmation of the two siblings coming along (their RSVPs went something like: "Yes, please!" and "Great, see you on the 28th!"), I trust my sources: DD's friend telling DD her sister is so excited about coming, and another mum mentioning how she's looking forward to catching up with X's mum and "her two" at the party.
What's the wise thing to do? Do I scrap DDs chosen activity?? Do I ring their parents to explain that I can't go over numbers this year? Do I wait to see if they actually turn up? Just not sure.