In the Fitzgibbon family there is Mr. Fitzgibbon, Mrs. Fitzgibbon, Paul, and Billy. The plow that belongs to Mr. Fitzgibbon and it is the main threat of living on the farm. When Mrs. Frisby put the powder in Dragon's food, Billy trapped her in a colander and she was terrified. The Fitzgibbons got the government to exterminated the rats house before they moved to Thorn Valley, but Mrs. Frisby heard their conversation and thankfully warned Justin who told everyone else.