What is the theme in The Scarlet Ibis by James Hurst?

Brotherhood is a major theme in this book. On the surface, it looks as if Doodle's brother wants to help him but there are also menacing undercurrents to his motivations. Brother's love for Doodle is bound up with cruelty and shame. Doodle, for his part, is strongly attached to, and reliant upon, Brother and his main fear is of being left alone by him.