I think we have a match, I think you have more information than I do but here's what I have.I believe my ggg Grandfather is William H. Murdock who married Susannah Hill on July 3, 1848 in Clinton County, Iowa (from Ancestry.com - Iowa marriages to 1850).Your gg Grandfather Francis Marion is a brother to my gg Grandmother Mary E. Murdock Conrad Conory.If you go to Crawford county, Iowa Genweb site and look under 1900 census, you will find Francis and his wife Martha.My gg Grandmother is listed under Mary E. Conory.She married my gg Grandfather ?? F. G. Conrad and had several children; one Fred C. Conrad that was born in Manilla and William H. Conrad.F. G. Conrad died and Mary Remarried Raylon Conory.They had a son Raylon E. Conory. I have Crawford county burial records from Ancestry.com with a Francis M. Murdock born 1858/Died 1938 Oakland cemetary Denison, Iowa and a Susan Murdock born January 8, 1826/Died April 11, 1909 Oakland cemetary in Denison, Iowa.There is also a F. G. Conrad and a M. F. Conrad in the same cemetary. I have more information if this is who your looking for and maybe we can exchange information.