/Grammar Nazi On
These three words sound alike, but are completely different in meaning. Using the wrong one makes you look like a retard. It completely baffles me that anyone who has grown up speaking English could ever posibly NOT know the difference between them.
There - A place.
They're - A contraction of the words They and Are.
Their - A possessive plural pronoun implying that a group has ownership over something.
Stop getting it wrong people, it's not rocket science!!!
/Grammar Nazi Off