I am sorry but I do not.
This is what I do know:
Ruben Graham would have probably been brother to the man lost at Shiloh (or even may have been his nephew), and his nephews of some sort were Daniel (great grandfather to the young man searching) and Ezekiel who was a brother to Daniel.
Daniel died in about 1948 after a long life and had five wives. Daniel's first wife was the one he loved, but she died in the flu epedemic of 1918.
Ezekiel called Zeke stayed in northern Mississippi while Daniel went on to central Arkansas out of western Tennessee where they were raised.