If anyone who is at the County Courthouse looking up records can you see if you can find info on two of John T's wives. The first is Mahala or possibly Martha Smith. On the 1860 1870 census its Mahala but on my great uncle Ezekial birth info its Martha. The other woman is Annie M. Roberts Carnett. Sometime between 1870 and 1880 they are married. In 1880 Annie and John had moved and where living in Eagle, Illinois.
John's last name can be spelled Deneston, Denison, Dennison, Denniston.