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Their! 
Their is for personal possession and usually refers to one or more people in ownership
Every parent should respect THEIR children's feelings.

A lot of people tend to interchange these words THEIR, THERE, THEY'RE because they sound the same. However, each word have its own function.

Their is the possessive case of the pronoun they.
There is an adverb that refers to a place or is used as a pronoun introducing a clause.
They're is a contraction of they are.