Your is a second person possessive adjective that is used as both the singular and plural form.

Which is the plural form of you?

Use ustedes for all cases of you in the plural.

What are plural pronouns?

A plural pronoun is a pronoun that is replacing a plural noun or a group of nouns. Plural pronouns don’t have singular forms; they are unique words that replace plural nouns.

Always use yours and never your’s. Although they look almost exactly alike, the version with the apostrophe is incorrect and will make your writing look unprofessional. Yours is a possessive pronoun that can show ownership of something. Your’s is a misspelling of yours.