How to request a refund for an app purchased by one of the members on Family Sharing?

If you got an email receipt and there's a 'Report a Problem' link in it, use that; otherwise, click here and ask the iTunes Store staff for a refund.

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After you have used the previous suggestion provided by Niel, you will want to either:

• Turn Off Purchase Sharing. This is what gives members the authorization to use your payment method for purchases.

How to share apps and purchases with your family - Apple Support

• Use Ask to Buy. This will allow you to authorize any purchase by a family member before it is billed to your card.

Approve what kids buy with Ask to Buy - Apple Support

• Use Screen Time Restrictions on members you do not want to make purchases.

Use parental controls on your child's iPhone or iPad - Apple Support