Individual Details

By 1780, William and Mary Ann were married.

The patent issued jointly to James And Mary Ann Cox in 1768 is a bit unusual - it's quite likely this was issued to them as heirs since they appear to have been brother and sister. Any other relationship seems impossible, and if there had been other siblings one would think they would have shared in the ownership of this patent.

Pittsylvania Co VA, DB 5, p.335
p.505 Articles of agreement between James Cox & William Macbee, James Cox of Henry Co and MareyAnn Macbee of Pittsylvania County. Having had a patent granted to them of 275 acres they with the said Maryanns husband William Macbee hath agreed upon a future division of the said tract or parcel of 275 acres, both sides east fork of Cascade Creek. James Cox's part: [metes & bounds; hard to read] William Macbee; pointers in Russells line.
20 Mar 1780. Signed: James Cox, William Macbee, Maryann (x) Macbee
Wit: James Cox, Dutton Lane
21 Mar 1780 proved by oaths of witnesses
Patent for 275 acres grated to James Cox and Mary Anna Cox on 20 Jul 1768. PB 37, p.269. Location given as above, except it was listed as being in Halifax Co in 1768. Likely brother and sister. Perhaps their father had died after getting the warrant for this patent although usually that is mentioned in the patent itself.

Pittsylvania Co DB 8, p.81
20 Nov 1786 William Macbee and Maryann his wife of Washington County, NC, to James Cox. of Pittsylvania Co VA. 75#'s. 137 acres in Pittsylvania Co, both sides East fork of Cascade Crk. Pointers in Russells line.
Signed: William McBee, Maryann (M) Macbee
Wit: William Short, John Parks, Aaron Hutching.
15 Jan 1787. Proved by oaths of two winesses. Further proved 16 Jul 1787
21 Nov 1786. William Short & John Parks, Esqr, JP's of Pittsylvania Co examined Maryann, wife of William and she relinquished dower.
This is land from the division with James Cox - they appear to be selling it back to him, probably in preparation for leaving Virginia.

After William and Mary Ann McBee moved to Tennessee, they lived adjoining one William Cox. No relationship has been established.

Birth	1756
Death	26 Oct 1840	Knox County, Tennessee
Marriage		William McBee

Spouse	William McBee (1756 - 1826)
Child	Libby McBee ( - )
Child	Lemuel McBee (1783 - 1843)
Child	Betsey Ann McBee (1780 - )
Child	Abigail McBee (1789 - )
Child	Gainum C. McBee (1799 - )