Anonymous wrote:It's weird to me that your kid would eat an ice cream in front of their cousins without you offering to buy them one as well. Ideally, the other set of parents would take turns treating. Since this is happening, I would plan on buying fewer snacks.
I think it's ok to only buy your kid a souvenir though.
This. It’s IME the expected scenario given these are nieces and nephews and not acquaintances or friends. Even with friends children though, people would expect the adult who’s paying to cover their kids as well if they are not in the shop with them.
Financially you now know your sister/brother will expect you to cover their kids so next trip you should take without them.