From the "Who Do You Think You Are/What It's Worth" category; the progenitor of “my” Graham line on this continent, most researchers agree, was John Graham. A List of the Early Settlers of Georgia states that John Graham, a farmer and tanner, arrived with family August 29, 1733 on board the Georgia Pink from London. From The Colonial Records of the State of Georgia Original Paper, Correspondence to the Trustees, James Oglethorpe, and Others 1732-1735 Vol. 20, there is a letter he wrote to James Oglethorpe, Jan. 22, 1734/5 mentioning a brother in London who wished to make the voyage. John left the Savannah Colony “for the Carolinas” about 1738.
I contracted with a genealogist in London to investigate John Graham. Unfortunately he reported, "In conclusion there is no certainty where the John Graham was born, or where he married or where the children were born. There is certainly no evidence that they were born in Scotland and the probability is that it was not Scotland. But whether it was in London or elsewhere remains unknown. At present time I cannot think of any other resources that might help resolve the problem."
And as an OBTW; my FTDNA Kit 130476 testing revealed J1c3d / L147.1+ / M267+ / P58+ (however the correct naming convention).