Who is Heather Hoodhood from The Wednesday Wars and what is their importance?

Heather Hoodhood is Holling's sister. Heather remains nameless for much of the novel, only being known as the older sister until Holling really begins to relate to her as another human being instead of an annoying member of the family. Heather is at odds with her father, as she is a democratic young woman who believes that the US should pull out of Vietnam. Her father, on the other hand, believes she is too young to know anything and believes even less in the "flower child" movement, of which Heather is becoming a part. Heather stands up to her father often, pointing out his faulty political beliefs and her own right to do as she pleased. When her father attempts to make her work for his architecture company, she informs him she is already working on the Bobby Kennedy election committee. Holling, in the background, begins to admire his sister, even though her treatment of him is less than kind. Even when Holling saves her from being hit by a bus, she treats him badly.