James Sullivan Clarkson, b. 17 May 1842 in Brookville, Franklin County, Indiana, d. 31 May 1918 in Newark, Essex County, New Jersey, son of Coker Fifield Clarkson & Elizabeth Goudie. He married Anna C. Howell on December 26, 1867 in Marion County, Ohio.
Joseph Russell Clarkson, b. 23 Mar 1855 in Chicago, Cook County, Illinois, d. 17 Jan 1923 in Kenosha, Kenosha County, Wisconsin, son of Joseph P. Clarkson & Juliet A. Russell. He married Esther Ann Wells on October 18, 1883 in Douglas County, Nebraska.