I believe the John J. Sisemore you are talking about is my great grandfather.The information I have has not been confirmed by me as yet, but I believe it may help you.
John J. Sizemore born 1822 in South Carolina died 24 Dec 1903 in Asheville, Buncombe Co., North Carolina married 1844 (I am not sure if he was married in Raleigh, NC or in SC)
1st Wife: Elizabeth Reynolds born 1824 Buncombe Co., North Carolina died Oct 1856
They had 7 children: Thomas W. James Miller Sarah Martha Alfred Nathaniel Taylor b. 1853 Emmett Wiley b. 1856
Elizabeth died shortly after giving birth to Emmett.John then married Emma Elkins in Davidson Co., TN.
Obituary of John W. Sizemore who is the son of Emmett Wiley states that Emmett Wiley was born in Jonesboro, TN Aug 31, 1856, the son of Dr. John Sizemore.He attended public schools in Tennesse until 18 years of age, when his father moved to Asheville, in 1874, where he enjoyed a large practice until his death in 1890. [The death date I have and the one given here are in conflict.]
James Miller son of John J. Sizemore born 4 Oct 1846 Elizabethton, Carter Co., TN died 24 May 1912 Buffalo, Union Co., South Carolina 1st Wife Elizabeth Nix 2nd wife Sally Henderson
James was in the Confederate Army, enlisted in Company A, 58th Regiment of North Carolina, in Mitchell Co., NC.He served during all but the last couple of months of the war, missing those because he lost an arm in the Battle of Jonesboro, GA.James filed to be recognized as a Cherokee in 1907 wherein he gave his father as John also known as "the old Indian doctor".He gave his grandfather as Jessee Sizemore and grandmother as Sookey Toney. (See ECA or Eastern Cherokee Application #M-1104 roll 249 claim file # 30986)
Nathaniel Taylor Sizemore Sr. born 1853, had a daughter by the name of Minnie.She stated that James was a school teacher.
Newspaper article from Buffalo, South Carolina newspaper: by Anna Brown Scout beautifies Buffalo Cemetery Trevor Strom's Eagle Scout project completes a labor of love his grandfather began. With the help of fellow Scouts, troop leaders and his parents, Trevor cleaned the historic Buffalo Community Cemetery. The cemetery is on Riley Road next door to the house of Trevor's grandmother, Ruby Varner. Trevor's grandfather, John Russell Varner, maintained the cemetery for many years, but he died before he could bring the grounds to his standards. Trevor, a 12-year-old seventh-grader at Sims Junior High, has been a Scout since second grade. He said when the time came to pick his Eagle Scout service project, the choice was easy. "I wanted to do it, and I couldn't think of anything else I would rather do," he said."And my grandfather wanted it done." No one has been buried in the cemetery since 1934, and the graves had been forgotten by many of Buffalo's residents, according to Mrs. Varner. She said her husband decided to clean up the cemetery after a Pacolet man had a hard time finding his grandmother's and aunt's graves. "The man couldn't get in for all the briars," she said."He used cutters until he found their graves." Varner began cutting the grass and trimming the brush.He died five years ago. Taking up where Varner left off, the Scouts clipped and hauled off brush and limbs, leaving the cemetery draped with dogwood trees. Trevor said his parents, Thad and Sandra Strom, helped him lift and repair the heavy broken grave markers. The Scouts from his troop, Union Troop 42, hauled dirt to fill sunken graves. Trevor and another Scout used 20 cans of black spray paint to cover a rusted wrought iron fence that surrounds the grave of the cemetery's lone confederate veteran, James M. Sisemore. Trevor researched Sisemore's background and found he was orignally from North Carolina.He volunteered for the army as a teenager. Sisemore was wounded in battle and his right arm had to be amuputated. As a final touch for the cemetery project, Trevor ordered a granite Confederate marker from the Veteran's Affairs Office for Sisemore's grave.
The article goes on but this is the important information.
I hope this can be helpful.I would be interested in having a copy of their service records.