Robert married Letta Ann "Lettie" Clonts on 15 Dec 1870 in DeKalb County, Tennessee. Letta (daughter of John William Clonts, Sr. and Mahala Caroline Hembree) was born on 15 Jun 1851 in Ellijay, Gilmer County, Georgia; died on 14 Jan 1918 in Nashville, Davidson County, Tennessee; was buried on 16 Jan 1918 in Central State Hospital Cemetery, Nashville, Davidson County, Tennessee. [Group Sheet]

1. Mary Helen Cantrell was born on 25 Mar 1872 in DeKalb County, Tennessee; died in 1899 in DeKalb County, Tennessee; was buried in Fuston Cemetery, Keltonburg, DeKalb County, Tennessee.
2. John Arval "Arval" Cantrell was born on 14 Mar 1874 in DeKalb County, Tennessee; died on 18 Aug 1918 in DeKalb County, Tennessee; was buried on 19 Aug 1918 in Fuston Cemetery, Keltonburg, DeKalb County, Tennessee.
3. Julia Lee Cantrell was born on 9 May 1876 in DeKalb County, Tennessee; died on 15 Dec 1949 in DeKalb County, Tennessee; was buried in New Bildad Primitive Baptist Church Cemetery, Smithville, DeKalb County, Tennessee.