If two or more nouns each own separate things of the same kind (individual possession), add possessive apostrophes after each noun. Moreover, the noun they own should always be plural. prosecutor’s and defendant’s speeches the hospital’s and clinic’s doctors

To make two nouns show separate possession, add an apostrophe and an "s" after each possessive noun. Ex: Kari's and Lynn's bikes are in excellent condition. (They each have a bike.) To make two nouns show joint possession, add an apostrophe only to the second unit. Ex: Cameron and Mitch's car broke down last week. (They share a car.)

Tip #1: If two nouns are equally showing possession, only use an apostrophe on the second noun. It is not uncommon to apply ownership to more than one noun. In these cases, it is only necessary to make the last noun possessive. The wedding belongs to John and Jane. John and Jane’s wedding. The club belongs to the boys and girls.

For apostrophes with possessive proper nouns, remember these three guidelines: If the noun is singular, add ’s (Kansas’s). If the noun is plural but does not end in s, add ’s (the Magi’s gifts). If the noun is plural and ends in s, add just an apostrophe (the Beatles’ greatest hits).