Dolores Umbridge. She only sent them after Harry Potter, the fact that Dudley Dursley was there was just an added bonus for her since not only did Harry get into trouble for using magic outside Hogwarts while he was under-age, he used it in front of a muggle.
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It's not explained in the movie, but in the book, when Dolores Umbridge catches Harry trying to communicate with the Order of the Phoenix at her unsupervised fireplace in Hogwarts, she reveals that she's the one who sent the dementors after Harry. She knew he'd cast the Patronus Charm, potentially leading to his expulsion from Hogwarts. The Ministry needed to do whatever they could to prevent Harry from spreading the word of Lord Voldemort's return.
Dolores Umbridge sent Dementors to attack Harry so that he would use magic and be expelled.
Harry Potter's aunt is called Petunia Dursley and his cousin is called Dudley Dursley. Petunia is his mother's sister.Vernon Dursley (Harry's uncle) also has a sister who Harry is forced to call aunt, her name is Marge Dursley.
Dudley Dursley.
Harry Potter's aunt and uncle are Petunia and Vernon Dursley. Petunia is the sister of Lily, Harry's mother. The Dursley's raised Harry after the death of his parents. They also have a son called Dudley Weasley who is a month older than Harry.
Harry Potter was usually babysat by Arabella Figg on Dudley Dursley's birthday but that day she tripped over her cat and broke her foot so couldn't look after him. As the Dursley's had nobody else to look after Harry - they were forced to take him with them.
Dudley Dursley did not die. In the seventh book, Harry Potter and the Deathly Hallows, Dudley and his family were simply hidden by wizards so that Voldemort could not come and kill them.