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These days, there are plenty of affordable kids' tablets on the market you can choose for your little ones. They're usually designed with a drop-proof case and kid-friendly software to make it easier to create an age-appropriate environment, all with minimal setup needed. But what if you already have a perfectly good tablet at home? Well, that can actually work as a kids' device, too.

If that old tablet still has a functional speaker and screen and can still connect to the internet and update apps, then it can readily serve as a shared tablet for the household. But of course, it needs a bit of tweaking to be as safe and suitable as possible for your kids. The setup can be more involved than what you'd get with a new kids' tablet, though, as you'll have to dive a little deeper into the device settings.…