I don't have any information about Margaret French but here is what I know about the Railey side of the family.
JohnRandolph's siblings were:(all were born in Burkesville, Cumberland, KY) -1)Caroline Elizabeth, b 6 Mar 1835 , d Nov 1926 Hartman, Prowers, CO, m William Cary 18 May 1854 Burkesville, KY;2) Susan Ann, b 9 Jun 1837, d 9 Feb 1839, Burkesville, KY;3) Isham Tarleton, b 18 Dec 1840, d 17 Dec 1935 Marshall, MO, m Loretta M. Bailey, 2 Dec 1869 Marshall, MO;4) William Nunn b 1842;5) Malvina Isabella Walker, b 4 Jan 1845, d 18 Apr 1921, Marshall, MO; 6) James Winchester, b 1848, d 1870; 7) John Randolph, b 14 May 1850, d 16 Apr 1842, Marshall, Mo, m Margaret French 23 Feb 1881; 8) Boone, b 20 Aug 1852, d 8 Aug 1871, Marshall, MO; 9) Nancy Hayden, b 1854, d 1872, Marshall, MO; 10) Mary O., b 1857, d Aft 1880, KY, m Thomas Perkins.
John Randolph and Margaret French had 4 children, Haydon W.b 13 Dec 1881, Bertha b 25 Feb 1883, Estell b 25 July 1886 and Mattie b 10 Jul 1889.
As far as I know John Randolph and Margaret are buried in Ridge Park Cemetary, Lot 3, Sec. 22 (from Cemetary Records, Marshall Public Library, Marshall, MO)
Sorry but I don't have any idea of what he did for a living but I imagine it was farming as most of the Railey's were farmers.I don't know anything about the French's either.I have a copy of the "The Raileys and Kindred Connections" and one of my cousins has done extensive research on the Raileys.This is where I have obtained most of my information.
If I can help in other way please lt me know.