Jay - I think the James Smith, son of John Smith Jr., was born about 1790 in now Hawkins Co TN. His mother, was the former Sarah Bailey of Sumner Co. After John Jr's death the mother married Micajah Lee and had two more children. James is mentioned as one of the heirs of John Smith Sr of Jefferson Co in a deed 1795. Those heirs were Samuel, John, Gideon, Britton, James and William. The only way I can fit those heirs into the known information is that Samuel was John Sr's son and administrator, John was his grandson by his son Alexander, and Gideon, Britton, James and William were grandsons by his son, John Jr.
James Smith sold his portion of his inherited land and his mother's dower to Micajah Lee December 1812. James's half-brothers, Gideon, Britton and William sold their portions to Micajah in Dec. 1800.