"A Muggle...it's what we call nonmagic folk like them. An' it's your bad luck you grew up in a family o' the biggest Muggles I ever laid eyes on."
     -- Rubeus Hagrid

Vernon and Petunia Dursley are Harry Potter's aunt and uncle, his only living relatives. Petunia is Harry's mother's sister. Vernon and Petunia have one son, Dudley. Vernon has a sister named Marjorie.

Vernon Dursley is a Muggle. In fact, he's about as Muggle as a person can get. He has no use for imagination at all. He wears his most boring tie to work and sits at his desk with his back to the window. Vernon Dursley considers it a good morning if he's yelled at a few people. The firm of which he is a director, Grunnings, makes drills. For Vernon, it's all about appearances. He wants nothing more than to be completely normal, thank you very much, although he also wants to be better than everyone else around him, too. He places high regard on things like which kind of car a person drives. In fact, when he gets a new company car himself, he stands out in the driveway with his wife and son exclaiming about how wonderful it is, all in voices loud enough so that the neighbors will hear. 

Vernon is a large, beefy man with very little neck. He has a mustache, although at one time he had pulled out some tufts of it. He doesn't care much for anyone who seems a bit different or who drives too fast or collects for charities or indeed anyone at all, really. He enjoys complaining loudly about things like the weather and motorcyclists, but especially about his nephew Harry. Vernon's goals in life include selling more drills, buying a vacation home in Majorca, and keeping anything remotely associated with magic away from his home and his family. 

Vernon Dursley attended Smeltings, a rather pristigious private school. Dudley is now attending Smeltings as well.

Petunia Dursley is tall and thin with a long neck. She is a nosey gossip who cranes her long neck around, noticing what everyone else in the neighborhood is up to. She has a friend named Yvonne. Petunia keeps her house immaculately clean and cooks wonderful meals. She dotes on her spoiled son; she feeds him huge amounts of food, gives him huge numbers of presents, and thinks he's as perfect as can be. Petunia can be vicious, however. She nearly starves her nephew, feeding him only stone cold tinned soup. 

While she was growing up, Petunia was disgusted by the way her parents were delighted with her sister, Lily, who was a witch and who attended Hogwarts. Petunia considered Lily to be a freak. Until the time of Lily's death, Petunia and Vernon pretended she didn't have a sister at all.