Do you have an iOS device with iOS 8 or later?
If you're the organizer, you can use these steps to make or decline the purchase from your iOS device with iOS 8 or Mac with OS X Yosemite:
- Open the notification to see the item that your family member wants to get. (See your notifications on yourMacoriOS device.)
- Approve or decline the purchase.
- If you approve, you need to sign in with your Apple ID and password to make the purchase.
After it's purchased, the item is added to the family member’s account andshared with the rest of the family group. If a family member downloads a previous purchase again, downloads a shared purchase, installs an update, or uses a redemption code in the store, the organizer won't get a notification.
If the organizer doesn't make the purchase or decline the request, it will be deleted after 24 hours, and the child will need to make the request again.
The organizer can also give another adult in the group permission to manage Ask to Buy requests. In iOS 8, tap Settings > iCloud > Family, tap your family member, then tap Parent/Guardian. In OS X Yosemite, choose Apple menu > System Preferences > iCloud, select your family member, then select Parent/Guardian.
Only one adult needs to manage each purchase, and after it's done, the purchase is final.
*Age varies by country or region.
Above from:
Request and make purchases with Ask to Buy - Apple Support
Also see
Family purchases and payments - Apple Support