In the 1930 census, Walter and Etta are still living with their now 12 yr old son Walter. Son, Walter, is listed as being born in 1917. Walter, aged 44, is married at age 28. Etta, aged 39, is married at age 23. If you want marriage records for Douglas Co. you can get them at the courts in Omaha or from Lincoln. If you get them from Omaha, the lookup is free but they charge for copies. Lincoln charges for a lookup even if nothing is found. Try 1916 then 1917.