Mary is Agnes' only surviving sibling. She is six years older than Agnes. Shortly after the family's misfortune, Mary and Agnes' parents ask her to do some drawings that they can sell for money for the family. It is at this point that Agnes decides that she, too, would like to help the family financially, and suggests that she could be a governess. Mary tries to discourage Agnes from this idea, telling her that she would not be able to handle life in a strange house taking care of another family's children. It is soon after Agnes begins working for the Murrays that Mary gets married to a pastor.