Harry Potter and the Sorcerer's Stone
They didn't think they could bear it if anyone found out about the Potters. Mrs. Potter was Mrs. Dursley's sister, but they hadn't met for several years; in fact, Mrs. Dursley pretended she didn't have a sister, because her sister and her good-for-nothing husband were as unDursleyish as it was possible to be. (1.3)
"I've come to bring Harry to his aunt and uncle. They're the only family he has left now."
"You don't mean – you can't mean the people who live here?" cried Professor McGonagall, jumping to her feet and pointing at number four. "Dumbledore – you can't. I've been watching them all day. You couldn't find two people who are less like us." (1.79-80)
He couldn't remember his parents at all. His aunt and uncle never spoke about them, and of course he was forbidden to ask questions. There were no photographs of them in the house. (2.98)