Who is Judy Tubb from The Emperor's Children and what is their importance?

Murray's sister chose to stay in Watertown instead of moving to the big city. She marries, becomes a schoolteacher, has two children, and becomes a widow, all in Watertown. Judy represents the common life, free of fame and free of New York City. She follows time honored routines, and even on 9/11 when the country is in shambles and shock, she keeps her hairdresser appointment. She dotes upon her son, Bootie, and when she believes Bootie is dead, she places all the blame upon Murray. To Judy, Murray represented a chance for Bootie to become great; when Bootie's essay angers Murray, and Murray send him away, Judy sees Murray's vanity as the cause of her beloved son's death.