We meet Dudley Dursley in Harry Potter and the Sorcerer's Stone. He is Harry's spoiled cousin. Dudley is the natural child of Vernon and Petunia Dursley. Mr. and Mrs. Dursley are Harry's uncle and aunt. Harry lives with them. They treat Dudley like a saint, and Harry like a servant.
In the first four books Dudley is overweight and is in fact turned into a pig by Hagrid when he starts eating up Harry's birthday cake in Harry Potter and the Sorcerer's Stone. He is put on a diet by his parents in subsequent books.
Dudley is alternately mean to Harry and very afraid of him and his powers.
In Harry Potter and the Order of the Phoenix, Dudley is into boxing, and is lying to his parents that he is going out "to tea" every night while in reality he and his gang are terrorizing the local streets. Harry threatens to teach Dudley a lesson but ends up defending Dudley from Dementors when they are both attacked.
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