They're​

Contraction

-Short for 'they are'

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-Typically followed by a gerundive (i.e. they are eating/drinking/being)

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Their

Possessive Third-Person

-Used to describe ownership

-Both singular and plural third person

-Who is that person? I like their sunglasses.

-My friends ate their dinner in silence.​​

-non-gendered​

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There

Location, existence

-Commonly used to refer to a person or thing that is not in one's immediate vecinity

-There's the sign for Montana.​

-Also can be used to express that something exists​

-There are lots of different varieties of flowers.​

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