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Daisy is Tom's wife and Nick's cousin. she knows Tom is cheating on her and is miserable about it, And she has a daughter that is hinted at that she doesn't really like, that she would have preferred a son

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Tom is Daisy's husband and rich, not richer than Gatsby but richer than Nick. He's cheating on his wife and most people know about it because he doesn't try to hide it

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Nick is the main character and the narrator of the story, He's cousins with Daisy and moved to West Egg next door to Gatsby in order to sell bonds. He's well off but isn't rich, and his house looks like a shack next to Gatsby's mansion