When I said in my posting, "I don't know much else about these McKemeys except that there was a George junior", I believe I was repeating an error I had read elsewhere. No children are known. Here is a progress report.
George McKemey died 10 October 1793 at the age of 79, thus he was born ca 1714. Margaret McKemey was born ca 1730 and died 30 April 1790. Both were buried at the old graveyard attached to the Waxhaw Presbyterian Church in Lancaster County, South Carolina. There is a nicely carved and clearly legible headstone for the couple.
George McKemey is said by some to have married Margaret Hutchinson around 1750 in Carrickfergus, Ireland.
On 13 January 1766, George McKemey bought 220 acres of land in Mecklenburg Co, North Carolina on the north side of Waxhaw Creek from Repentance and Mary Townsend. This was very near the wagon road which then divided NC and SC.
(Much later this fell into Union Co, NC, created from Mecklenburg Co, NC. Andrew Jackson was born on the James Crawford land adjoining George McKemey's. Both tracts became Thomas Crawford's property, a fact which apparently helped perpetuate the error that Jackson was born at McKemy's rather than at his brother-in-law's a short distance away.)
On 9 September 1784 William Barnett willed land to his son Robert Barnett joining lines with Archibald Cousart & George McKemy.
Lancaster County, South Carolina deed book A, pages 131-132 (from Holcomb's transcription) says that on 1 October 1784, Robert Barnet sold to Archibald Cowsart 190 acres on both sides of the Wagon Road which is the state line, adjoining George McCamy's land and others.
Lancaster County, South Carolina deed book C&E, pages 70-71 (from Holcomb's transcription) says George McCamy of Mecklenburg County, North Carolina on 25 August 1790 deeded a slave child to his niece Elizabeth Crawford of Lancaster County. Witnesses: John Stephenson, James Crawford. Proved by John Stephenson 11 September 1790 before Robert Dunlap JP.
Mecklenburg Co, North Carolina deed book 14, page 48 says George McCamy sold his land on 3 January 1792 to Thomas Crawford.
The problem I have is that I amusing secondary sources. One of them is a reasonably scholarly approach to locating Andrew Jackson's birth place and includes a discussion of land in that area where the Carolinas meet north of Lancaster. However, it cites the 1784 deed from Robert Barnett to Archibald Cousart and emphasizes the phrase "Estate of George McCamy" on the east to prove that George was dead by 1784 and the deed had to have been made by a George McCamy junior. Holcomb did not transcribe the deed with the word "estate", but his is not always a careful reading. First of all, we know that old George was alive. so (1) did the deed really say "estate of" and (2) even if it did, why (since it wasn't)?
Also, I am now at a loss to connect to the original query from William Moores McKemie: "Do you have anything on GEORGE McKAIMY or McKAMIA mentioned in Mecklenburg Co., NC "Pleas and Quarter Sessions", book 6 item 349, Aug 1821 Session ? [Ordered that Elias Alexander Sr. administer on the estate of GEORGE McKAIMY, deceased, who was qualified and gave bond with James Wilson security in the sum of 2000 pounds.]"