Robert married Catherine Temperance Gilbreath on 14 Nov 1909 in Hamilton County, Tennessee. Catherine (daughter of Joseph L. Gilbreath and Eugenia Christine Curtis) was born on 16 Oct 1887 in Walker County, Georgia; died on 17 Oct 1967 in Oak Hill, Fayette County, West Virginia; was buried in Poe Cemetery, Soddy-Daisy, Hamilton County, Tennessee. [Group Sheet] [Family Chart]

1. Grover C. Cox was born on 14 Feb 1919 in Raleigh County, West Virginia; died on 11 Jan 1988 in Cincinnati, Hamilton County, Ohio.
2. Gordon Cox was born on 25 Apr 1922 in Daisy, Hamilton County, Tennessee; died on 28 Jan 1923 in Daisy, Hamilton County, Tennessee; was buried in Poe Cemetery, Soddy-Daisy, Hamilton County, Tennessee.