What is a compound possessive?

A compound possessive occurs when possession is expressed for two or more nouns that are joined by the conjunction “and.” The compound possessive can be written in two different ways depending on the intended meaning:

• Both nouns are written in the possessive form if the two entities possess two different things (e.g., “Jayden’s and Tessa’s bicycles”).
• Only the last noun is written in the possessive form if the different entities possess something collectively (e.g., “Lexi and Sam’s kids”).