How does Peter’s outlook on change shift from the time he moves to Princeton and the end of the novel, and what are the catalysts of this shift?

Peter suffers from insecurities and fears that affect his relationships with his family and friends. What are these issues and how do they manifest themselves?

Despite their struggles, the Hatcher family sticks together and stays solid. How do the nature of the family and the relationships between each member allow for this persistence?