Robert was the son of Robert Boyd (abt 1717-1782) of Halifax VA and Granville NC. Census records indicate that Robert was born in Virginia. According to the Equity papers of 1852 maintained by the Genealogical Society of the LDS Church, Robert had about 16 children from his first wife (name unknown).
1. Elizabeth Ann Boyd, married Basil Woolley, Alabama
2. Alston Boyd (no children and died before 1852)
3. Erby / Irby Boyd, Tennessee
4. Mary Boyd, married Joseph Prater, Hall County, Georgia
5. Robert Boyd Jr., (married Mary Polly Atkinson), one son: John H. Boyd
6. Thomas Boyd, Cal.?
7. Livinia "Linney" Boyd, married Jacob Elrod, Georgia
8. William Boyd, Alabama
9. Huldah Mahulda Boyd, married Benjamin Green "B.G." McCleskey, Hall County, Georgia
10. Nancy Boyd, married Green Cain, Forsyth County, Georgia
11. Harrison Boyd, (perhaps died young, as a son by Rachel was also named Harrison)
12. Sarah Boyd, married Thomas Barton, Alabama
13. Dicey Boyd, married Thomas Norvall (? unsure of last name spelling), Cass, Georgia
14. Susan Boyd, married Jonathan Cannon, died in 1849, left at least two sons: James (in Alabama) & Robert Cannon (in Georgia)
15. Margaret Boyd, married William Graham, Alabama
16. Lucy Boyd, married John Langley
(Source 1852 Equity Papers with LDS Church and Down Home Genealogy "Robert Boyd's 24 Children")

Robert's second wife's name was Milly Fowler, with whom he had one child (Jeter) but in the early 1820s she left and eventually went to Wayne Co., TN taking baby Jeter with her.

In the mid 1820s, Robert formed a common-law type marriage with Rachel Hinton and they had (per LDS Equity papers & 1850 census) seven to nine children
1. Warren
2. Harrison
3. Robert A
4. John A.
5. Huldah (Showing on 1850 census)
6. Amanda
7. Ann
8. James (Showing on 1850 census)
9. Moses J. (Showing on 1850 census)

Robert died in September 1851 and was upwards of 80 years of age. Descendants of S. Walker Boyd (1875-1944) who lived along Piney Creek Rd off Earls Bridge Rd in the 1st quarter of the 20th century, stated that its believed that Robert was buried in what they called the Boyd Cemetery (called 'Boyd Family Cemetery on Pickens cemetery websites) which was shortly north of the east side of Heavens Way. Per a descendant and local residence there were 22 small markers in cemetery before its desecration in the 1970s.

Sources on Cemetery: Local resident/descendant on Heavens Way and second-hand information reported by S. Walker Boyd's grandchildren.
(Source on Robert's family: Film # 008196582 on "Robert Boyd" Pack No. 1 , Equity records (original loose papers), ca. 1800-1870, URL: https://www.familysearch.org/search/catalog/476680?availability=Family%20History%20Library
URL Details: South Carolina. Court of Equity (Pickens District) on "Robert Boyd" Pack No. 1 , Owned by: Genealogical Society of the Church of Jesus Christ and Latter-Day Saints)