3 quotes that show Liesel's and Han's relationship

Liesel observed the strangeness of her foster father's eyes. They were made of kindness, and silver. […] Upon seeing those eyes, understood that Hans Hubermann was worth a lot. (Chapter 6)

"You know, Liesel? I nearly wrote you a reply and signed your mother's name. […] But I couldn't. I couldn't bring myself." (Chapter 16)

Unofficially, it was called the midnight class, even though it commenced at around two in the morning. (Chapter 7)