Convert existing Apple ID to Child Apple ID
Hello Everyone,
Due to the number of Apple devices in our home, and being personalized to each other my children (both under 13) have their own Apple devices. Because my wife and I did not want them to have access to our accounts, I created separate Apple IDs with their names and my date of birth, but I manage (They don't know passwords, etc). so that they could use facetime and iMessage with their grandparents from their own devices. As they have gotten older, they have also developed their own taste in music and apps and have used the different Apple IDs with iTunes cards they get for gifts sometimes and as rewards.
With the roll out of iOS and Family sharing I now have a situation where it would be nice to share some (not all) of the purchases spread across 4 accounts but when I add my children's accounts under family sharing it shows them as adults , Appleid.apple.com wont allow me to modify the birthdays for my kids to the correct dates.
I know for a fact I am not the only one in this situation, so I'm asking the following
Is there a way to convert my kid's existing Apple IDs to the new Child Apple ID accounts so that I can approve iTunes purchases if I link them through family sharing?
iPhone 5, iOS 6.0.1