His wife was Sarah J. Stout March 1845 / August 6, 1902. They were married on January 19, 1860 in Washington County, Arkansas. Both are buried in the Cox Cemetery.
His children: William Samuel Cox September 1862 1938 Robert Coleman Cox August 7, 1867 March 7, 1934 George Henry Cox December 11, 1868 June 14, 1948 Alvin Finnis Cox March 6, 1871 July 17, 1936 Charles A. Cox abt 1873 John Burrell Cox abt 1875 Maude Cox abt 1877 Thomas Cox February 1881