I see a 1940 census with a Thomas Scott listed as brother to head of household, Mercedes Scott b 1900 P, single. Living in Johnstown, Cambria, PA Thomas has a son, Phillip 12, PA. Thomas listed as married but no wife included on census
Could this be your Thomas? The location was the clue for me. If youknow of a sister, Mercedes, then its him.
Tried searching Phillip for the 1930 census but could not find, but you might keep looking.