I assume--but cannot prove--that these were sons of Charles Abernathy (17??-c. 1796) and Alice (Ellis) Short Abernathy and brothers of William Abernathy (1742-1832), who came to Giles County, TN.What is my evidence?Elizabeth Denty Abernathy's The Abernathy Family (Pulaski, TN, 1929) identifies them as relatives of her great-great-grandfather, William, and she knew two of William's children although she was probably not much into genealogy when they died.William Abernathy's account book from the 1790s mentions Laban and virtually suggests a business relationship between the two.There is not much archival material in Dinwiddie County, VA, because the Federals burned the courhouse during the Battle of Five Forks, but one of the few things which has survived is a court book that includes some cases involving, in various combinations, William, Laban and Harmon--I am not sure about Freeman.One of them married a Drake, and William's daughter married a Drake while coming through Nashville--they traveled in the same circles.On the other hand, William's son, Charles Clayton Abernathy, does not mention them in the memoir he wrote for his children just before his death in the 1870s.
I found it interesting that you say Clayton says Laban and Freeman were brothers.I had not noticed although my uses of Clayton have been for other than family purposes.
I might tell you there are still Abernathy and Drake place names in the White's Creek area in Nashville--William rented a transition farm on White's Creek during his stay in Nashville.I assume the names are not for William--perhaps for Jonathan Drake--but for someone(s) in the Laban, Harmon, Freeman group.
I might also add that a Laban Abernathy's death was announced the other day in the Nashville Tennessean--I believe he was actually living out of town with kids.I was tempted to write and say, "Who are you?" but I still have some restraint left.
I will be glad to dialogue about this issue if you are interested.