How old was your child(ren) when they had there first overnight w/grandparents?

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I have an older son (8yrs) who lives with his dad, so he was about 2 when he had his first overnight alone at his Nana's. However my two younger ones that live with me haven't had an overnight with there grandparents alone yet. And when I say alone I mean without me or there dad with them, and that is only because they don't live in the same state as us so when we go to visit we all go. Hopefully when they get a little older to fly alone they can go visit and stay a few nights or even weeks.