Herself going to Hogwarts, herself being a witch, and not her sister.
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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'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.
Petunia Dursley, Harry's Aunt
If you don't want any spoilers for the Harry Potter series, I would advise that you don't read this.Aunt Petunia's howler said, "remember my last", and was from Dumbledore. It was meant to be a reminder of the letter he sent her when he put Harry on her doorstep when he was one years old, and that letter said basically to take care of Harry as if he was her own son. However, Petunia did not care for Harry as her own and was prepared to throw him out when they thought Harry had attacked Dudley with the Dementors, but Dumbledore sent her the howler.So basically, all in all, the howler meant to remind Petunia of Dumbledore's first letter and to not throw Harry out, as this is something she would not even consider doing to her own son.
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.