This has been suggested by DelicateBean and MissFrosty, about 2 months ago, but its great!
i guess so, it should need both players to do the command to close the account and when it is closed both players get their money back.this would be nice, but people tend to break up like 5 seconds after getting married, so imagine getting w some1 just to come back later when you've been gone for a while to find that some1 stole all of your cash and left you
The bank plugin is based on UUIDs and does not support multiple to my understanding. This is one of those ideas that sounds better on paper.