Livre d'Or

"And yes, it makes sense that if your parents came from a non-middle-class background, they didn't have that shared idea of what children's books "everybody" should read."

Not necessarily. Ga-Ga was the daughter of Eastern European immigrants but she was totally immersed in the so-called classics, both children's and adults'. Of course, her parents apparently made a deliberate effort to acculturate and to bring their children up as British.