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Teresa
Teresa is the oldest of the Frisby children. She helps with the younger ones. She is also the most mature.
Martin
Martin is the oldest male in the family (since his father died). He does not like "Auntie Shrew" who lives next door.
Timothy
Timothy is kind of the whole problem of the story. Since he had pneumonia it set the whole scene and it caused problems to.
Cynthia
Cynthia is the youngest Frisby in the family. She tries to help but does not always succeed. She also worries a lot.