The third-person plural pronouns are they, them, theirs, and themselves. The third-person plural possessive determiner is their. These words are used to refer to more than one of anything: people, things, concepts, places, animals, and so on.

grammar the form of pronouns and verbs that people use when speaking or writing about other people: "He," "him," and "his" are third person singular pronouns, and "they," "them," and "their" are third person plural pronouns.

Plural third-person pronouns refer to more than one person or thing. The most common plural third-person pronouns in English are “they,” “them,” and “their.”