The morning show I listen to on the radio was having a discussion about apostrophes and last names.
We've all agreed that it's correct on holiday cards and the like to say "The Lastnames" (no apostrophe -- it's plural, not possessive).
So, one of the morning show hosts posted a photo album on the show's facebook page that he title "This Weekend at the Detrows."
One person said it's fine. One person said it needs an apostrophe between the "w" and the "s." I think you need an apostrophe after the "s" because the title is an abreviation of the sentence "This Weekend at the Detrows' house" and the house belongs to multiple Detrows.
Am I correct? What's the rule on this?