ok, for me, i will just be firm in my words.
I would say (example his name is A)
A, no, do not do that ok? it's not very nice.
I would say it infront of his mother.
Since we would go for playdate. i would expect you to be nice and play nice too.
But if the mother don't seem too happy about it.
Honestly i would say end the playdate outing.
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