Sorry,I do not know the name of Reuben's father, but I am looking for similar information. Were you successful??
A Reuben Harris was an early settler of Trigg Co. Ky in the early 1800's. This Reuben may be the father of John B. Harris, b/abt. 1798 in VA and married in KY to Elizabeth Oliver in 1821. John and Elizabeth had James T. Harris, 1st KY Cav. Co. G, CSA. Does any of this information fit your information?