There - A place. I.e. The TV is over there.
Their - Belonging to them. I.e. It is their TV.
They're - Shortened form of 'they are'. I.e. They're over there watching their TV.
Their - Belonging to them. I.e. It is their TV.
They're - Shortened form of 'they are'. I.e. They're over there watching their TV.
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