family purchases
How do I stop other adults on my family sharing from making purchases?
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The only way to do that is to turn off Purchase Sharing.
link-> Set up Family Sharing - Apple Support
One adult in the family — the family organizer — can set up Family Sharing for the group from their iPhone, iPad, iPod touch, or Mac. If you turn on purchase sharing, you'll be asked to confirm that you agree to pay for purchases initiated by the family members you invite and that you have a valid payment method on file.