When you're referring to one person, the apostrophe comes before the s, so Dr. Seuss's birthday is the correct one. Another example: Toys that belong to the girl ----> The girl's toys Toys that belong to the girls ----> The girls' toys
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IkiaNouns of one syllable form the possessive with 's.it didn't help me
Hess's, Wess's, Seuss's, etc.
Nouns of more than one syllable ending in an s or z sound form the possessive with just an apostrophe OR apostrophe and s. Jesus' or Jesus's; Cummings' or Cummings's.