Phoebe

Catcher In The Rye
Phoebe Caulfield is Holden's younger sister and his foil. She is in the fourth grade at the time Holden leaves Pencey Prep. In some ways, she can be even more mature than him, even criticizing him for childishness, although she clearly idolizes Holden. Holden also idolizes her, in a way. She is the only character who seems to understand her brother's disturbed personality. Near the end of the book, Phoebe attempts to run away with Holden out west. Holden refuses to take her, and in the end he refuses to leave altogether, becoming a "catcher in the rye" for Phoebe.