Mary Ann McClerin was born on March 26, 1826 in Pennsylvania to George McClerin and Meriah Gordon. She was married to Silas Johnson on August 3, 1843 in Holmes County, Ohio. They had seven children: Frank A. (b. October 31, 1845), Joseph S. (b. January 30, 1848), Clarence Delano (b. November 12, 1850), Nathan H. (b. September 19, 1851), Alice Ervilla (b. May 4, 1856), Adda Estelle (b. September 26, 1858), and Agnes Erminnie (b. April 13, 1863). Mary Ann was widowed when Silas was killed in the Battle of Champion Hill in the Civil War. She was living with her sons Nathan in Clarence on a homestead in Columbia, Brown County, South Dakota from at least 1880 onward. Mary Ann passed away on April 6, 1900 in South Dakota.