What Jo says about...
The Dursleys

Please note: unless you see quotemarks, these are summaries, and not JKR's word themselves. Please see the linked article for the actual text.

• Harry will, in the long term, get back at Dudley. [Read the exact quote from the Book Links interview, 1999]
• The Dursleys explained away Dudley’s pig tail by telling staff at a private hospital it was a wart that had grown out of control. [Read the exact quote from the Scholastic chat #2, 2000]
• Did Harry ever use magic on Dudley in the real world? JKR: "Not so far (hint)" [Read the exact quote from the Yahooligans! chat, 2001]
• There’s stuff coming with the Dursleys that people might not expect. [Read the exact quote from The Oregonian, 2000]
• JKR sees Dudley as just as abused as Harry, though perhaps not in such an obvious way. [Read the exact quote from the Cinescape interview, 2000]
• JKR: "You should keep an eye on Dudley. It’s probably too late for Aunt Petunia and Uncle Vernon. I feel sorry for Dudley. I might joke about him, but I feel truly sorry for him because I see him as just as abused as Harry. Though, in possibly a less obvious way." [Read the exact quote from the Fandom.com interview, 2000]
• Harry has never used the internet because he gets beaten up if he goes to close to Dudley’s keyboard. But wizards don’t need the internet; they have something more fun to find out what goes on in the outside world. [Read the exact quote from the Raincoast Books interview, 2001]
• Of all her characters, JKR dislikes Uncle Vernon the most. [Read the exact quote from World Book Day, 2004]
• We will find out what Dudley experienced when he saw the Dementor. [Read the exact quote from World Book Day, 2004]
• In book 6, Harry will have "the shortest stay in Privet Drive so far. " [Read the exact quote from World Book Day, 2004]
• Aunt Petunia is truly a muggle, but there is "a little bit more to Aunt Petunia than meets the eye." "She is not a squib, although that is a very good guess. Oh, I am giving a lot away here. I am being shockingly indiscreet." [Read the exact quote from Edinburgh Book Festival, 2004]
• Dudley is nothing more than he seems; he gets very few lines in book 6. [Read the exact quote from Edinburgh Book Festival, 2004]
• When Aunt Petunia said Lily turned teacups into rats, she was exaggerating a little, although "just like her son, Lily was not averse to testing the limits of the Statute of Secrecy, so you can safely assume she will have had a few warning letters – nothing too serious, though." [Read the exact quote from Jo's website]
• What did Dumbledore's Howler to Aunt Petunia mean? ("Remember my last?")
  Dumbledore is referring the letter he left for Petunia upon the Dursleys' doorstep (along with Harry). It was his "last" because there were letters to Petunia before that. A day later, JK clarified that Dumbledore was not thinking of school letters he sent to both the Dursleys. [Read the exact quote from Jo's website]
• In Book 6, Harry will not stand trial again; he will leave the Dursley’s for a much pleasanter reason. [Read the exact quote from Jo's website]
• Harry’s Evans grandparents died natural deaths. There is “nothing sinister” about their deaths. [Read the entire quote from the Leaky Cauldron, 2005]
• The magical protection Harry receives from staying at the Dursleys will not hold once he turns 17 and becomes a man. [Read the whole quote from ITV, 2005]
• Petunia knows about dementors because she "overheard a conversation" between Lily and someone else. But there is more to it than that; we will earn more in Book 7. [Read the whole quote from ITV, 2005]
• Aunt Petunia has never performed magic, and will never be able to do so. [Read the exact quote from Jo's website]
• When asked about Aunt Petunia being oddly flushed when she heard that Harry would only be returning to Privet Drive once more, and whether this meant Aunt Petunia harbours some hidden fondness for Harry and the connection he provides to the wizarding world, Jo said that as with all the best and penetrating questions it is difficult to answer. She would say that “There is a little more to Aunt Petunia than meets the eye and you will find out what that is in book seven” [Read the whole quote from RCMH2, 2006]