Who is Peter Hatcher from Fudge-a-Mania and what is their importance?

Peter Hatcher is a fifth grade boy from New York City. He lives with his mother, father, brother Fudge and sister Tootsie in an apartment. Peter is a responsible boy. He looks after his brother and disciplines him. He does the same with his sister. But Peter sometimes has a hard time with his family because his siblings are so loud and energetic. They often cause a ruckus and it is always chaos when the Hatcher family is around. Peter has one arch enemy: Sheila Tubman. Peter thinks she is gross. When he learns he must share a summer house with her, he feels his world is over.