What is the main conflict in Crow Lake by Mary Lawson?

This novel is about the disappointments between siblings that can result in lifelong misunderstandings. Kate Morrison is only seven years old when her parents are killed in a car accident and her older brother Luke decides to take custody of the younger girls so that his brother, Matt, can attend university. Matt is the first in their family to go to college. However, a one-time mistake leads to circumstances that end Matt's hopes of higher education. Crow Lake is a novel of catastrophe overshadowed by tragedy that changes destiny. It is a novel of sibling love that overshadows even reality.