There were a total of 16 members of the Coffey "clan" serving in Company F, 26th North Carolina (according to an article in Confederate Veteran magazine, vol. 4 (1896), p. 312). Company F was known as the "Hibriten Guards" or "Carolina Mountaineers":
I just learned that eight Coffey brothers were present at Gettysburg in Company F, 26th North Carolina; of these, five were killed or mortally wounded and the remaining three were wounded but recovered (per Confederate Casualties at Gettysburg, by John W. Busey and Travis W. Busey, 2:1026-1030, but I don't know the original source. By the way, this sets two records in my years of research on family members who served together at Gettysburg - both for the number of brothers present in the battle; and the number of brothers who died there.) They were:
-Asbury F. Coffey, Private, Company F, 26th North Carolina, finger shot off July 1, returned to the company Dec 1863. Oldest of the eight brothers present in the battle.
-Cleveland Coffey, Private, Company F, 26th North Carolina, mortally wounded July 1 in the bowels, died two months later.
-Henry C. Coffey, Sergeant, Company F, 26th North Carolina, wounded in the wrist July 1, captured July 5 in a field hospital, exchanged early 1864.
-J. G. Coffey, Private, Company F, 26th North Carolina, mortally wounded July 1 and captured, left arm amputated, died in a field hospital on July 4.
-J. H. Coffey, Private, Company F, 26th North Carolina, killed July 1, shot in the chest.
-Jesse Patterson Coffey, Private, Company F, 26th North Carolina, shocked by a shell (usually a concussion from a bursting shell).
-Thomas M. Coffey, Private, Company F, 26th North Carolina, mortally wounded July 1 in the chest and captured in a field hospital, died August 12, 1863 in a division field hospital.
-William S. Coffey, Private, Company F, 26th North Carolina, mortally wounded July 1 in the thigh, died August 20, 1863. Youngest of the eight brothers present in the battle.
If George Washington Coffey was indeed serving a teamster at Gettysburg, he might have carried some of his own kinfolk back to Virginia in his wagon or ambulance - Asbury, Cleveland, and possibly Jesse. If he was not there, he may still have encountered them at Staunton, Virginia.