Lisa never lived in the house in New Bern.
-- Riley (chapter 2 paragraph 4)

Importance: This quote is the first mention of the ghostly sister, and a hint that she was never a real part of Riley's life.

There are all sorts of abuse.
-- Danny (chapter 4 paragraph 5)

Importance: Danny says this to Riley when she offhandedly comments that their parents weren't that bad, that at least they didn't abuse them. As the story goes on, the reader learns that Danny suffered acutely from his parents' neglect, and particularly from the way they attempted to rewrite his memories.

I had a box of treasures and nobody to share them with.
-- Riley (chapter 8 paragraph 5)

Importance: Riley says this when Danny rebuffs her attempts to show him some old pictures and videos of them as children. For Danny, the past it a minefield and too dangerous to tread through; but for Riley, who is longing for family, the pictures are a way to keep a hold on...