"He who marches out of step hears another drum." ~ Ken Kesey
's means one subject has ownership (grandparent's crew means ONE grandparent (either grandpa OR grandma) "owns" the crew)s' means multiple subjects have shared ownership (grandparents' crew means MULTIPLE grandparents (grandpa AND grandma) "own" the crew)no apostrophe just implies multiple grandparents are in the crew, but there is no ownership implied.
For some reason this has me confused, maybe its my 6th grade education but I have a customer that needs some text printed on the back of some shirts and a question on apostrophe has come up. What is correct?GRANDPARENT'S CREW (one grandparent has a crew, singular possessive)GRANDPARENTS' CREW (both grandparents have a crew, plural possessive )GRANDPARENTS CREW (a crew made up of grandparents)ROBERT'S CREW (one person named Robert has a crew, singular possessive)ROBERTS' CREW (the Roberts family or a group of people whose first name is Robert have a crew, plural possessive)ROBERTS CREW (a group of people whose first name is Robert make up the crew)contractions are another discussion altogether...
Or in the case of Roberts, If the person's name is Robert it would be Robert's crew. Ifthe name is Roberts then it would be Roberts' crew
Their is no mistaking that there apostrophes should be they're.