CloudKit API and Family sharing info

Does CloudKit API allow to enquire default Family members of the account holder and create a default share between them without the users having to manually set it up?

Most Apple Native apps (for example: Reminders app) do create a default "Family" share when they initialize the App which is very convenient for users.

Apple Developers in WWDC do claim emphatically that they use the same CloudKit API to build iCloud features for Apple native apps like Notes, Reminders.

But, maybe I am missing something, I can't find the API in cloudKit that will be provide the info needed to setup a default Family share without hassling the user ... just like the native apps do.

Any pointers or clarification is deeply appreciated.
CloudKit API and Family sharing info
 
 
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