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their

Their means a person or thing that belongs to or was made by them. (adjective)

An example of their is a sister of two siblings.
An example of their is a book written by two authors.

See their in Webster's New World College Dictionary

possessive pronominal adjective

of, belonging to, made by, or done by them: also used before some formal titles [Their Majesties]: often used in connection with a preceding singular pronoun (as everybody, somebody, everyone): did everybody finish their lunch?

See their in American Heritage Dictionary 4

(Þâr)

adjective The possessive form of they.

Used as a modifier before a noun: their accomplishments; their home town.
Usage Problem His, her, or its: “It is fatal for anyone who writes to think of their sex” (Virginia Woolf). See Usage Notes at he¹, they.

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