Let your kids play with your Android phone, download some apps. And I am sure tomorrow you will need to factory restore it.
If you create another account just for your kids, and secure your own, you'll need to do nothing tomorrow.
Otherwise, it would be similar to letting your kids play with your PC while the admin account is logged in. Good luck with that.
Let me see iOS do that for you. If you give your kids your iPhone, by tomorrow they;ll have about $400 worth of apps on it, ran out of memory and bogged down as hell.