Are you talking about
Amazon Household or just where someone logins into your account and purchases something from it (which is essentially password sharing)?
What is an Amazon Household?
A Household allows you to connect and share Amazon benefits with the whole family. Two adults and up to four teens and four child profiles may link in a Household.
Adults (18 and up)
Two adults in a Household can share digital content and if they are Prime members, Prime benefits.
Teens (13-17 years old)
Teen logins allow teens to shop on their own and parents approve the order with a simple text. Teens may also access certain Prime benefits if their parents are a Prime member.
Learn more
Teen logins are not currently supported on Kindle
Children (12 and under)
Parents can add children to a Household to manage parental controls on Fire tablets and Kindle e-readers through Kindle FreeTime. Personalize each child's experience by selecting what content they are able to see, and set educational goals and time limits. Children can access digital content that their parent allows on their child's device but are not enabled to shop.
The Amazon Household Program enables two adult family members to share streaming access to thousands of movies and TV shows with Prime Video
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FTR saved CC's has nothing to do with an Amazon Household. This is where you are literally sharing your Prime benefits with those in your household. I have shared benefits with my husband as I'm the one with the Prime account. Having multiple shipping addresses is also not related at all either. You can ship to wherever you want really or pay with whatever method you want really.