Harry never saw Vernon such a shade of purple. "You almost killed him!" Dudley was cowering in fear behind Aunt Petunia. "How dare you do that to your cousin!?"
Petunia must have said something wrong because his uncle seemed even angrier. "We are raising a delinquent and it sure isn't that Potter boy! I've had enough. I will not let you damage both kids.
I stood by and let you try to stamp out his magic and look where it almost got him. Killed! Can magic even be stamped out! Or was it an excuse to kill him!?"
Many social workers later, Dudley and Harry were sent to live with Aunt Marge. Harry was to sleep on the couch while Dudley was given the spare bedroom. As a precaution.
That boy never seemed to do anything without permission and she had to get on Dudley for breaking Harry's glasses. She was careful with both boys as she knew the Vernon divorced Petunia for what he said, was her abusive treatment of both boys. But she couldn't help but think the delinquent, no Harry manipulated her brother somehow. Though, Harry who tiptoed when he had to move, was scared to eat, and only spoke when spoken to, may be the reason why.