Spouse:
Clara Hesperia Bannister (married around 1881)
Children:
Seven children, One adopted child: Walter Bannister, Edward Chester, Marjorie, Helen Clara, John (he died in infancy, 1893), Elisabeth Mannering, and Robert; Alfred Edward Bannister (Clara's nephew, adopted in 1898)
Family Members Who Have Served in the Minnesota Legislature:
He came to Minnesota in 1879. He moved to Duluth, Minnesota in 1892.
Congdon served as the Minnesota representative to the Republican National Convention in 1916 (MNopedia).
Congdon built Duluth's Glensheen.