Not receiving parental requests in family sharing

Hello there Emmac3009,

If I understand correctly you are not getting prompted to approve a request from a device using Family Sharing. Take a look at this info from the following article named:

Get help using Ask to Buy in the iTunes Store

Finish setting up Family Sharing

Even if your iCloud account has Family Sharing and Ask to Buy enabled, you might need to finish setting up Family Sharing or confirm your iTunes Store account.

You can select Set Up in the "Unable to Ask Permission" message, or you can confirm your account on your iPhone, iPad, iPod touch, or Mac:

• In iOS 8, go to Settings > iCloud > Family and tap your name. If you see Confirm Account under Family Purchases, tap it and follow the onscreen instructions.
• In OS X Yosemite, go to Apple menu > System Preferences > iCloud > Manage Family and click your name. If you see a Confirm button, click it and follow the onscreen instructions.

Using Ask to Buy on an unsupported device

iOS 8 and OS X Yosemite are required to set up or join a Family Sharing group and are recommended for full functionality. When you try to initiate a purchase on an unsupported device, you'll still be asked to request permission. However, you won't get a notification when the family organizer makes or declines the request. If the family organizer makes the purchase and your content doesn't download automatically, you can tap the price again to download the item.

If you're asked to finish setting up Family Sharing from a supported device, use an iPhone, iPad, or iPod touch that's using iOS 8 or a Mac using OS X Yosemite, then follow the above steps. You can use these steps to update to the latest version of iOS.

Thank you for using Apple Support Communities.

Regards,

Sterling