I don’t understand this English question and need help to study.

Using William Faulkner’s “Barn Burning” as the source to cite, write a five-paragraph essay in response to: Sarty Snopes, at the beginning of the story, accepts his father’s (Abner’s) enemies as his enemies (linking them together), but by the end, the son betrays the father after realizing something which severs their link. What is that something? To be clear: what happens to Sarty which causes him to abandon is father, the rest of his family, and the only life he has ever known? Form your thesis statement, find three citations (remember, one per supporting paragraph), and argue your point.