Lura and the unknown Southworth Spouse had two sons, Rafe Ray, born 1893 and Leo Leroy, b. 1896. Lura was listed as unmarried in the Brayton household in the 1880 Census and on Find a Grave as Lura Southworth, died 1900. Estimated marriage date would be before 1893 and after 1891.
Other websites show possible marriage certificate available that I don't have access to.