In Chapter XV of "The Story Girl," titled "A Disobedient Brother," the narrative focuses on the tensions within the King family, particularly concerning the character of Felix. Struggling with the expectations placed upon him, Felix often finds himself at odds with his family, leading to conflicts and misunderstandings. This chapter explores themes of sibling relationships, the desire for independence, and the implications of disobedience.

Through various incidents, Felix's rebellious nature is put to the test, prompting him to reflect on his actions and their consequences. The chapter illustrates the complexities of familial bonds and the challenges that arise when one seeks to assert their individuality while navigating the dynamics of family life. L.M. Montgomery skillfully captures the essence of youthful defiance and the journey towards understanding one's place within a family.