I wonder if this CSA Soldier is related to your Robert BANISTER?
PVT Robert M Bannister CSA SMITH's Regiment Tennessee Cavalry
He is also listed as R M Bannister 8 Confederate Cavalry.
Dr Robert Martin BANNISTER b 9-19-1880 is listed in WWI draft records.
Bailey Funeral Home Records (URL below) site is difficult to read. But using your Edit/Find Feature will help. There are several BANISTER's listed. One Jennie born 1880 died 1951. All are Missouri burials.