Hattie is Oriel and Lester Lamb’s eldest daughter. She seems to grow up much more quickly than her sisters, and she becomes the marbles champion of the neighborhood. She’s overjoyed to marry a dull but pleasant young man named Geoffrey Birch, and their wedding coincidentally occurs on the same day that Quick returns home after years of living on his own. Hattie is the only Lamb to permanently move away from Cloudstreet during the novel, as she goes to live with her new husband after their wedding.