Make it easier for switching between accounts that are on the same Family Subscription plan. Something more like Netflix or Hulu where once you're logged in you can choose to switch to one of the linked profiles/accounts. You could even allow families to set access controls between the accounts (ex. *optional* parent could access child profile without needing login but switching from child to parent would require entering the password).
Updated on 2018-01-04
Hello and thanks for the feedback!
A similar idea has also been suggested here:
Add your votes and comments there please! ;)