Pat, Here is the information I have on the parents and siblings of Zachariah Sneed, Sr.Some of it may contradict some of the information you have.This information is from microfilm charts in the Tennessee State Archives.Beyond that, I cannot confirm that it is correct.Here goes:
Zachariah Sneed, Sr. was the son of William Sneed #1, who was a decendent of Samuel and Alice Sneed of New Kent Co., Virginia.There was no listing of who Zachariah's mother was.
William Sneed #1 had the following children:
1) Benjamin Sneed, b. abt 1735, m: (1st) Jemima or Jemimale ? in abt 1754.m: (2nd) Mary Ann "Polly" Perry ("His housekeeper before Jemima died") in abt 1758.
The children* of Benjamin Sneed and Jemima were: (a) John Sneed, b. Feb 2, 1755, m. Sarah Johnson on Jan 10, 1784. (b) Frances Sneed, m. David Garth on Nov 23, 1781. (c) Susannah Sneed, m. George Faris on Dec 24, 1797. (d) Peggy Sneed, m. Richard Johnson
The children* of Benjamin Sneed and Mary Ann "Polly" Perry were: (a) William Sneed #3, b. abt 1760, d. Nov 25, 1836, m. Lucy Stevens in abt 1794. (b) Lydia Sneed.
* From "Snead, Sneed, Sneyde, 1967"
2) Alexander Sneed, b. abt 1736, d. abt 1762 in Albermarle Co., VA.
3) Zachariah Sneed, Sr., m. Martha ("Patsy") Nance in Henrico Co., VA in abt 1764.
4) Charles Sneed, b. abt 1738, m. Mary Guillam in Henrico Co., VA on Dec 16, 1767.
5) William Sneed #2, b. abt 1739 (See "Sneeds of Fluvanna").
6) Robert Sneed, b. abt 1740 (Had 12 Children).
7) Jacob Sneed. (I have a question mark next to this name in my records.)