Thanks to Ancestry's new collection of NC Death Certificates, I busted through a brick wall and found parents for Marvin WATERS and beyond.

Here's what I have. Please post a follow-up if this is your line or if you have info to share. I have collateral lines and am happy to share.

Marvin WATERS (30 Sep 1877 GA - 13 Feb 1960 Mocksville, Davie, NC)
m. Geneva Milton NAIL (9 Aug 1883 NC - 22 Aug 1973 Mocksville, Davie, NC)

Children:
Milton Henry (1902), Samuel Edwin (21 Aug 1904 - 29 May 1974), John NAIL (14 Apr 1907 - 19 Nov 1961), Ida Elizabeth (1910), Ivey NAIL (21 Sep 1912 - 19 Mar 1962), Robert Grady (8 Sep 1915), Mary Margaret (23 Oct 1918), Geneva C (22 May 1921) and Jean G (4 Aug 1923 - 19 Aug 1968).

Parents of Marvin WATERS:

Joseph M. WATERS (abt 1850 Hall County, GA)
m. Emma HARGROVE (abt 1855 Jackson County, GA)

Children:

Lela (abt 1873), Sallie C. (abt 1874), Mary C. (abt 1876), Marvin (above), John H.M. (abt 1878), Joseph Richard (12 Jan 1880 - 9 Apr 1915).

Parents of Joseph M. WATERS:

Richard H. WATERS (abt 1808 SC - bef 1880 GA)
m. Evania M. EBERHART (abt 1815 GA)
on 29 Mar 1832 in Hall County, GA.

Children:
TE (abt 1832), TF (abt 1835), JF (abt 1837), JA (abt 1838), William (abt 1840), Permelia Jane (abt 1843), R Henry (abt 1846), Susan ( abt 1847), Joseph (see above), James N (abt 1851), Margaret (abt 1854), Pernecia (abt 1860), Lillie (abt 1862) and Jane (abt 1864).