This article explains how to remove a family member from Apple Family Sharing on an iPhone, iPad, iPod Touch, or Mac. Family Sharing is supported on devices running at least iOS 8.
How do you remove someone from Family Sharing if you are under 13?
You can remove someone from Family Sharing via the Settings app so you can no longer share purchases with them.
Open the Settings app on your iPhone, iPad, or iPod touch.
Tap your name at the top. If you don’t see it, go to Accounts & Passwords > iCloud Drive.
