Hi Melanie, My maiden name was Dotson and I am also from East Tennessee. In our family tree we have a grandfather named Reubin but ourgrandmother name was Margret. This still could be the Reubin you are searching for. He may have had more than one wife. If so his father is Moses Dotson his mother is Sarah Roberts. Moses and Sarah had 4 children Reubin, Mary, James and Charles. On all the sites I have researched there is very little information on this Reubin. Hope this helps.