I have a pro subscription which I believe I should be able to share with member on my Apple Family plan.
My subscription works perfectly but my daughter and father are unable to activate the Pro features but clicking the ‘Restore’ button either on the Apple TV, iPhone or iPad.
As long as it’s in app, the Apple ids are included in your family, and everyone has the latest version of iOS and tvOS. You also have to have purchase sharing setup in your family account (this means everyone shares one credit card)