There was no way that one night of Leo’s stupidity, his debauchery, was going to ruin her daughters’ future, not when they’d worked so hard, not when she’d pushed them to dream big. They were not going to community college.
-- Narrator (Chapter 1 paragraph 14)

Importance: Melody is angry because she had planned for her part of "the nest" to go toward her daughters’ college educations. She swears that she will not allow Leo’s actions to negatively affect her daughters.

In Leo’s company, Jack felt like a lesser version of his older brother. Not as intelligent, interesting, or successful, an identity that had attached to him in high school and had never completely gone away.
-- Narrator (Chapter 1 paragraph 40)

Importance: Leo had always believed he was a not as good version of his older brother. He’d always felt he had the need to prove himself around his older brother.

It was the organizing principle of...
-- Narrator (Chapter 2 paragraph 2)