Ever since website Pottermore launched, J.K. Rowling, "Harry Potter" author, has dedicated herself to creating extra content for those who love the saga of the boy wizard who attended Hogwarts, often providing stories for characters that remained mostly in the background for the 7-book series.
In the most recent story published in Pottermore, J.K. Rowling from "Harry Potter" reveals the truth about Harry's Aunt Petunia and Uncle Vernon, who raised him from the time he became an orphan at 1 until he received his letter from Hogwarts and shipped off to learn magic at the Wizarding School.
According to The Independent, J.K. Rowling from "Harry Potter" explains the rift as such: during Lily's final year at Hogwarts, she and boyfriend James went on a double date with Petunia and then fiancé Vernon Dursley, who already knew about how his future wife's sister was a witch.
J.K. Rowling from "Harry Potter" explains that, during the meeting, Uncle Vernon was patronizing to Lily's then-boyfriend, James, saying that he was sure that wizards lived from social welfare - to which James, who readers know was fairly cocky, explained that his family was actually incredibly rich and their fortune was held at wizards' bank Gringotts in solid gold.
The Guardian reports that Vernon never got over that comment, and couldn't stand James afterwards, even choosing not to attend Lily and James' wedding - and then, when he and his wife were forced to tend to their son, Harry, he always resented the young child because of his resemblance to his father.
In all, as J.K. Rowling from "Harry Potter" explains, Vernon's dislike for Harry stemmed from a similar place than Severus Snape's in the books.
According to E! Online, the revelation about the Dursleys came this Tuesday, when J.K. Rowling from "Harry Potter" celebrated what would be Dudley Dursley's 35th by telling the story of how the long-running rift between sisters Lily and Petunia Evans (who would then take the names of their husbands, Potter and Dursley, respectively) back when the two were dating the men they'd end up marrying.