Charles B. Congdon (1853-1922) was born in Northbridge, Massachusetts, and died in Evanston, Illinois. He was a grain broker. He married Cynthia Congdon (b. Willsie) in Chicago, Illinois, in 1876. Cynthia was the sister of Lucinda Willsie who was a student of Mary Baker Eddy's, a member of The First Church of Christ, Scientist, in Boston, Massachusetts, and a practitioner and teacher of Christian Science. Lucinda Willsie was a member of the Congdon household in Evanston for most of her adult life. Congdon's wife and daughter, Elizabeth Congdon, were also members of The First Church of Christ, Scientist, in Boston.

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