I'm having a little birthday tea for my STB 4 yo DD with around 4 kids from nursery, plus her cousin and baby brother. The GPs and my DSis and BIL will be here, plus my DH. Can't decide if I should tell parents they can just drop the kids off and pick them up after a couple of hours or ask them to stay. Then do I need to cater for the adults too? Is it complete madness to assume we could keep a bunch of 3/4 yos under control without their parents? Will parents think I'm rude for telling them they needn't stay? Am I overthinking it all?