Info taken from Rockbridge Co Death Register, 1853-1870, death certificates 1912-1917
Info on page 126 reads: Norcross, Robert (white male) d. 4 Jul 1861 of Flux, aged 4 yr, s/o Thos.J. & M. Norcross, b. Rck, Thomas J. Norcross reptd.
This is how I came to assume he was the son of thomas J. Norcross & Mary Unknown.