Guidance - Mixed Bag of Platforms

I'm still struggling a bit to figure out how to manage our suite of passwords. Between my wife and I, we have a MacBook, iMac, and two iPADs - I also have a work PC and a home PC. Would I buy 1Password for each system (2 Macs, and 2 PC) and two iOS applications? Or is there a way to purchase it on one Mac and share it across the other systems via Dropbox or something? I am looking for guidance on how to use this tool in a 'Family' rather than 'Individual' user context. If anyone can point me to an area of the site for further explanation, that would be much appreciated. Thank you.
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