Phoebe is Holden's younger sister, known for her intelligence and precociousness. She is someone Holden deeply cares for and connects with, representing the innocence of childhood that Holden longs to protect.

Allie is Holden’s deceased younger brother, whose loss profoundly affects Holden. He is remembered fondly by Holden, and his baseball mitt, covered in poems, serves as a symbol of Allie's spirit and goodness.

D. B. is Holden’s older brother, a World War II veteran-turned-writer who has found success in Hollywood. While he does not appear in the narrative, his life decisions and cynicism influence Holden's views on adulthood.

Jane Gallagher is an important figure from Holden’s past, with whom he once shared a close, innocent friendship. Although she does not appear in the story, Holden's memories of her highlight his feelings about lost innocence and unfulfilled connections.