The four children of Mrs. Frisby's are Teresa, the oldest, Martin, Timothy, and Cynthia, the youngest. When Timothy gets pneumonia the other three are always there to help him get through hard times. They might not always get along, but Teresa, Martin, Cynthia, and Timothy all love each other very much. The other three are always worried when their little brother is sick and when it is a bad disease, they all hope he will not die. Timothy is sick most of the time and the picture shows him finally healthy.