Child apple id mixed up with parent
I have two children on my family share, and one is set up perfectly. The other child is somehow mixed up with my apple ID, and his ID password is working for my apple ID and his apple ID is being treated as both a child under 13 and the parent in charge of the account. My phone keeps switching to his contact information, and he keeps getting my text stream and his own at the same time. Help!
iPad 2, iOS 9