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Their
They is the third-person plural personal pronoun (subjective case) in Modern English. It can also be used with singular meaning, particularly in informal contexts, sometimes to avoid specifying the gender of the person referred to.
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Theirs (pronoun)
That which belongs to them; the possessive case of they, used without a following noun.
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Their (determiner)
Belonging to, from, of, or relating to, them (plural).
“they will meet tomorrow at their convenience;”
“this is probably their cat”
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Their (determiner)
Belonging to someone (one person, singular).
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Their (adverb)
misspelling of there
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Theirs (pronoun)
used to refer to a thing or things belonging to or associated with two or more people or things previously mentioned
“a favourite game of theirs”
“they think everything is theirs”