Thanks to all who responded to my query regarding Charles Sumner Ross and Bertha Smith. I still do not have information about them after the 1930 census. I was able to find out that Lincoln Elmore Ross married Ruth Burkill and had 3 children probably all still living. According to Ruth's obituary Lincoln Ross died in 1949. Ruth later married Roy M. Smith, who I believe was the uncle of Lincoln Ross and brother of Bertha Smith.