"When you're a Jet, you're a Jet all the way
From your first cigarette to your last dyin' day!"
-- Riff, singing The Jet Song from West Side Story
The thirteen clans were started by the Antediluvians in the dawn of history. In a few cases, fourth generation vampires rose up and diaberlized their sires, stealing their power and becoming third generation themselves. To be considered a clan, a group of vampires must come from a member of the third generation; they also have to share clan disciplines and a clan weakness. If an Antediluvian dies, then any clan they created is relegated to bloodine status. Some bloodlines actually started because powerful members of the fourth generation changed the clan disciplines and weakness they passed on to their childer. Other bloodlines started because of vampire experiments.
Most clans are known for Embracing certain kinds of people and being interested in specific things, and the stereotypes are just truthful enough to be useful. And a clan becomes a vampire's new family in more ways than one. First, vampires don't choose which clan they belong to; their sires choose them. And secondly, vampires don't choose who's in a clan with them. If anything, vampires take "sibling rivalry" to new heights. And last, clan ties are forever; even a rebel will still have the same special weakness and disciplines. While there are a few, rare exceptions to these rule, they are so rare as to be beside the point. Because, as the song in West Side Story goes, "When you're a Jet, you stay a Jet."
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