Margot Frank, Anne's older sister, is sixteen at the start of the play and eighteen at the end. At least through Anne's eyes, Margot is smarter, quieter, prettier, and more grown-up than Anne. The two sisters don't often get along, are not close friends, and don't confide in each other much. Margot tells Anne that she envies her relationship with Peter, but only the idea of having such a friendship, not actually the boy himself. Margot shows that she is mature and caring by encouraging Anne's relationship with Peter, and by not being bitter with Anne for having a close friend. Whenever we get glimpses of Margot's personality, we can't help but think that Anne probably underappreciates her.