Doctor's notes

Apostrophes are often put in the wrong place in people’s (of people), others’ (of others), women’s, men’s and children’s (of women, men and children). People are also reluctant to use apostrophe ‘s’ with names ending in ‘s’, like James or Chris, but modern style is James’s and Chris’s. Classical or historical names can leave out the final ‘s’ depending on style; remember to record all instances on your style sheet.

Don't include the final ‘s’ when you have made a name plural, so you would say the Kennedys’ dog rather than the Kennedys’s dog.