I've got two siblings for a play date. I'm good friends with their mum and they've been here before.
So far between them they've displayed appalling table manners despite being asked not to do what they were doing.
Pulled faces whilst I asked them not to do this and back chatted.
Broken a toy intentionally by battering it on the floor, which I heard from downstairs 
Pushed and kicked each other, and DD.
My daughter has also been a nightmare, and it makes me wonder if the other mum lies when I ask if she's been good on play dates. 