School aged children should have already been Home educated enough to know right from wrong and what they are allowed to touch or never tough.
I Safe store all my Nic/Flavoring/PG-VG of large quantities. I have 3 grandchildren in the home and all are very well versed in what vaping is and why I, my Wife and my youngest daughter vape.
There is often smaller bottles of mixed e-liquid around for refilling.
They are happy there is no longer smoking on the main floor of the home where they normally reside.(Their smoking parents live below)
Though they have an occasional question, usually smell related, they never attempt to touch anything Vape related.
Each family must make their own choices.
Hopefully they will be wise choices.
Education is important.
And that's the problem the OP faces with an adopted child from foster care. many of them were not taught anything about right & wrong.