I'd recommend you keep different accounts then if a book purchase is made that you want to share -- deregister that Kindle from its own account, register it on the account that owns the book you want, send the book to the Kindle, and then degister/register the Kindle back to where it belongs.
That is what our family does and it works well.
That way we don't have to mess around with the gift cards or dividing up credit card bills. We just take turns buying the popular books on our own account and then sharing them using deregister/register.
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