The Five Families are a elite group of fashionable clique's each from the top five prep high schools (Constance, Brearley, Nightingale , Chapin , and Spence ) on the Upper East Side of New York City. There is a secret council composed of the leaders of each clique that was founded by Blair Waldorf.
Gossip Girl QuoteEdit
Just like the mob, New York prep schools have their own five families. You may be the John Gotti of Constance, Little J. But that doesn't mean you'll ever be a part of this Cosa Nostra.