To add to my previous post about birthday parties, unlike in Europe where kids parties are almost always drop off from like 3yo, in the US parents are expected to stay. Most parents wouldn’t even allow a drop off anyway. If it’s a playspot parents sort of have to stay for liability - when your kid has a dance/gym class until legal age to stay alone parents must be in the building too. So no, you cannot just drop the kid off and go do something with the sibling 🤷‍♀️