Q: Family Notifications never received after child attempts to buy app

We have Family Sharing setup correctly on my son's iTouch and on my iPhone 5.  Notifications are set to ON for Family.  However, after my son attempts to purchase an app, and provides his password for his iCloud account, I never receive the notification.  I was at the Apple Store today and even the employees there had no idea why it wasn't working.  5 hours after we tested this by attempting to buy an app on his iTouch, I still have not received the notification.  The Apple Store employees verified all of the settings were correct on both devices.  Any ideas would be greatly appreciated!