About Thomas Scott Brown
Marriage record of son, Zenas Brown, spells Thomas' name as Thos S. Brown. Source: https://familysearch.org/ark:/61903/1:1:XJFG-XFY
1900 United States Census: His son, Zenas Brown, enumerated that his father and mother were born in Ohio.
In looking at the actual marriage record, I believe that this is Thomas S. Brown who married Nancy Bell on Aug 1, 1843 at Preble, Ohio, USA. Source: https://familysearch.org/ark:/61903/3:1:939L-FCLN-J?mode=g&i=18&wc=Q3NM-82W%3A122037101%2C122065601%3Fcc%3D1614804&cc=1614804