I am coming up this same tree from a different branch - James Northcutt.My family's records mostly concur with yours:
Katherine Elizabeth Ruth Watkins b. same d. 12/12/1898
James Northcutt b. March 15, 1820 d. August 14, 1871
The fartherst back I know for Katherine is that my 3G-Grandfather married her in Shelby County, TX in 7/1843.His father with Gideon Northcutt.I am unable to get past either of these two.While I am writing specifically about Katherine, I would appreciate any info on either:)
P.S.All of my records indicate the second 'T' in Northcutt was dropped immediately following James.