Family Sharing

The only problem is that you can’t manage parental controls without an apple device, except on the phone itself.

What you could do tho is use their Iphone, go to Settings < Screen Time and configure whatever settings you'd like such as a chosen password by you so that, after a chosen time spent on a app, you're child wont be able to use it again until the next day.

You could also choose whihc days certain apps could be usen.

Or also filter some search results.

Have a great holiday!

What would you like to share?

Looks like you would like parental control. Family sharing is usually made to share subscriptions.