Stacy is believed to be the female twin to her fraternal brother, Knacy. From the generous Andrews, Drumright, & related families on the free-pages.genealogy.rootsweb. ancestry website. EPHRAIM ANDREWS' will named six children (although there may have been others, unnamed in his will), three of them daughters. Daughter Stacy Andrews would have to be Drumright's wife by the process of elimination; and from the fact that SHE SIGNED HER MARRIED NAME AS "Stacy Drumright" in witness to another marriage.From the Mecklenburg Co marriage records: Allen, Gray & Molley Nance, 16 Dec. 1791, William Drumright sec. Notes from grooms brother Darling Allen, wit. Stacy Drumright & bride's father, Robert Nance, wit. Drury Allen▪ The name Andrews was sometimes recorded as Anders or Andrus in various records. 
The births of several children of William Andrews and wife Avis were recorded in the Bristol Parish Register. 
Ephraim b. 4 Feb. 1720/21 ▪ Geo: b. 14 Jan 1722/23 ▪ Winifred b. 1 June 1724 ▪ Avice b. 7 Dec. 1727 ▪ John b. 7 July 1729 ▪ Luciana b. 9 Sept. 1731 
Ephraim's mother was actually recorded as Amy rather than Avis in his birth record, but a later deed by William Andrews' widow Avis Andrews to Ephraim Andrews referred to Ephraim as her son. 
Deed Book 4, page 335. Avis Andrews of Dinwiddie Co., widow and relic of William Andrews late of Dinwiddie Co, deceased, paid by her loving son, Ephraim Andrews of Mecklenburg Co, VA.▪ Recorded 10 Oct. 1774. 
These birth and baptismal records indicate the William Andrews Sr family was living in Bristol Parish from at least 1721 until 1732 when Luciana was baptized. ▪ However, William Andrews Sr's 1770 Dinwiddie Co will named several children whose births were not recorded. Most if not all of those children whose births were not recorded must have been born either before 1721 or after 1732. ▪ The unusual name Avis has appeared again and again in families that moved from Bristol Parish, VA to Brunswick Co (later Lunenburg and Mecklenburg). These same families were closely associated with each other. They include Andrews, Bowens, Baileys, Mize, and Granger. I have not found a single case of the name Avis in a Lunenburg or Mecklenburg family that didn't in some way relate to the families that came from Bristol Parish. ▪ 
Curiously, four children from two different Bowen families and two different Andrews families were all baptized on the same date in Bristol Parish. But no children from other families were baptized on that date with them - only Andrews children and Bowen children. ▪ Luciana, daughter of William and Avis Andrews, and Phoebe daughter of Richard and Mary Andrews were all baptized on July 30, 1732. 
William Andrews (Jr) and Richard Andrews who witnessed the 1740 will of James Vaughan Jr. were two of the sons of William Andrews (Sr) and wife Avis of Dinwiddie Co. ▪ These two sons were certainly in the Lunenburg area at that time. It is believed that William and Richard Andrews were the eldest sons of William Andrews Sr and Avis, both born before Ephraim Andrews whose birth was the first recorded in the Bristol Parish records. DB 2, page 396. William Andrews of Dinwiddie Co. sold 280 acres of land to Ephraim Andrews of the Parrish of Saint James of Mecklenburg Co. Ephraim Andrews is the son of William Andrews. Rec. 14 May 1770.