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To determine how to punctuate a compound possessive, first determine ownership.
If two people own something jointly:
Ben and Jerry's Ice Cream
If two people both own separate things:
Ben's and Jerry's houses (We're assuming that they each have a house that they do not own jointly.)
GREAT- ANSWERED MOST OF MY ?. BUT WHAT IF BOTH NOUNS ARE PRONOUNS LIKE "HER AND MY BIKE," FOR EXAMPLE? THX, P. GOTSIS
Do you agree that Gayle and Oprah's Road Trip is correct since they shared the trip.(one trip)
The "Grammar Lady" on the Oprah show said that it should be a compound possessive since they both took the trip. I disagree since they are not talking about trips taken separately. A listener had called in to say that the show was advertising it incorrectly with the compound possessive, and the "Grammar Lady" said it was correct.
There's not much you can say about 'compound posessives', but there is about language in general. If you could come back, in let's say about four hundred years, you would have a difficult time recognizing the English language.
What about if you're saying it in 1st person? (Ben and mine's? Mine and Ben's?)