Harry Potter's aunt, Petunia Dursley, and uncle, Vernon Dursley, were very neglectful, bordering on abusive. It is implied that they frequently locked him in his bedroom, which was the cupboard under the staircase, for accidental magic, believing that they could rid him of the magic this way. It was also implied that they denied him food during these times. He was made to do most household chores such as cooking and gardening, while their son Dudley did absolutely nothing all day but eat, play Video Games and watch TV. They did not ever show him any sort of affection, and regularly belittled him for his 'freakiness' a.k.a. his magical abilities. However, this was out of fear of his magic rather than actual negative feelings for him.
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.
Petunia Dursley is the sister of Lily Potter, Harry's mother. This makes her Harry's aunt. Vernon is her husband Harry's uncle, and Dudley is their son, his first cousin.
He lived with his aunt and uncle because his parents had been killed and they were his only remaining family. As hsi aunt was his mother's sister it enforced some old magic which helped protect Harry.
Harry Potter's aunt is Petunia Dursley, née Evans. Petunia is Harry's mother, Lily's, sister. Petunia and her husband Vernon raised Harry after the death of his parents.Vernon Dursley also has a sister, Marge, whom Harry is forced to call Aunt Marge.
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.