My elder GS and I used to make a point of doing something 'naughty' when he was small. It was usually something very minor like 5 minutes extra TV, but he loved it. When DDs were young my FIL used to serve them lemonade and chocolate biscuits in the morning when we stayed. We turned a blind eye and it doesn't seem to have harmed them.
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. Nothing was said about Peppa Pig or Ben & Holly for a half hour here and there!
I think mum knows, especially if DGD is a bit unwell or had a busy day at nursery, plus she's gone back to work and has relaxed quite a bit about things.

