How do you form the plural and the plural possessive of family names ending in s?
Form the plural of family names ending in s by adding es. For example, below are the plural forms of the names Myers, Daniels, Forlines, and Collins:
Form the plural possessive of these names by adding an apostrophe after the final s:
the Myerses’ house
the Danielses’ cat
the Forlineses’ car
the Collinses’ boat
Read more about apostrophes.