Agreed, it’s unpredictable but more likely at a beginning of year that they would join. I’d be too stressed with this possibility to be honest.
That being said, yes as PP have said I wouldn’t go all out on a huge expensive party.
Keep it simple, bouncy castle, bubble machine, and regular cheap party food in generous quantities - those siblings may eat! I like Iceland for this as it’s decent quality and not overly expensive ; although I usually do homemade as cheaper still, but 30 is a lot even if you keep it simple ;
I’d rather throw in a couple extra pizzas in the oven and have large bowls of crisps (usually cheapest way) and know they have something to grab, the parents will restrain them from the rest and usually feed them before, but they’re usually close in age, it’s treat food, and it’s always nice to tell the parents so I obviously couldn’t provide for siblings for everything but please know they can help themselves to pizza and crisps as I planned extra for those.
That + a kettle and a cheap box of coffee + tea, and you’re sorted. I personally wouldn’t provide food for parents aside from the tea/coffee bonus, as you have to stop somewhere.
I do homemade and it’s a lot of extra faff for those numbers, but budget… if you can, I’d go Iceland type.
If extra crisps / pizza left, keep them in the treat cupboard, freeze the pizza.
@NoLostCause If you’re worried about saving the date you can just send a WhatsApp message, just saying your date, about to book, ‘would everyone’s kids be happy with a bouncy castle and also a quieter crafts corner, hoping to suit all ! Could you also please let me know if any dietary requirements ? Understand if siblings need to join, will have extra pizza available in case any hungry, if that suits all !’.
Just keep it light, don’t need to ask for RSVPs just yet.
At least it’s probably what I would do