I have now been able to establish that John Vickers, who appears in the Clarke County, Georgia censuses of 1820 and 1830, was the brother of William Vickers, who filed a Revolutionary War pension claim in 1832. The parents of William and John were another John and his wife Alice (Unknown). The Vickers family emigrated from Augusta County, Virginia, to Orange County, NC before the Revolutionary War. William and John Vickers, Jr. moved on to Wilkes County, Georgia (the part later incorporated into Oglethorpe County) in the early 1790's. Both moved to Clarke County about 1800. John remained in Clarke while William moved farther west to Merriwether County.