When Rupert J Thomas was born on 10 February 1885, in Boyce, Rapides, Louisiana, United States, his father, Jones E. Thomas, was 28 and his mother, Sarah Elizabeth Davis, was 21. He lived in Jackson, East Feliciana, Louisiana, United States in 1910 and Ward Ten, Rapides, Louisiana, United States in 1930. He died on 10 December 1936, in Alexandria, Rapides, Louisiana, United States, at the age of 51, and was buried in Hot Wells, Rapides, Louisiana, United States.