Can you provide some birth and death dates for your ancestors? I am having trouble placing them generation-wise. I would love to know more about them.
Is your Mary Harvey Davis the wife of Robert Ross, b. abt. 1728, died 14 Sep 1790? If so, I think this fact would be a major breakthrough in researching this family line.
The only family in my database that matches your info is Samuel Ross (b. abt. 1781, Bath Co. VA, d. ?) and Hannah Adaline Scott (b. abt. 1781, Maryland, d. ?). I have 7 children for them, most born in Cabell Co, VA but one son Livingston b. abt. 1812 in Kentucky. I show a Robert Ross, brother of Samuel b. 1814 in Cabell Co, VA and d. 1902 in Kentucky. That Robert married Elizabeth Adkins on 18 Jun 1840 in Cabell Co., VA.
I don't have either John Robert Ross or a Mary Harvey Davis. Could John Robert be listed as simply Robert in some records? I find that to be the case with many of the male Rosses in my tree - they tended to drop their first names in daily use. Please feel free to contact me directly for more detailed info on my ancestors and their siblings.