Hello good sirs. I am Sir Vegito, and I am here to educate you on how to use proper grammar. Remember, use you're for insulting, and your for possession. Never use the slang "ur". Have a nice day sir.
How to use "their" Edit
-Their for possessive (ie "It's their cat")
-There for location (ie "The cat is over there")
-They're for describing (ie "They're all the way across the street")