I think James was the son of John Fullwood and Eliza Mercer. They are found in Ware County census records from 1820 till his death in 1855 and hers in 1880. She was born in Roberson Co., NC in 1803. They had two sons apparently, James and John.
James and Elizabeth Thrift suppossedly married 16 Mar 1876. Elizabeth's parents are believed to have been Carr Thrift 1805-1880 and Lydia Partin born 1831.
Sorry that's all I have on them. Not my direct ancestors, just ran accross them in my research and made a few brief notes.