Gerta still at home 1920 Hennepin MN.It looks like marriage ended in CA.
CA BIRTH INDEX PARKHURST 4-16-1926 Royal Spencer, Contra Costa Co 9-18-1927 Marie, Alameda Co Mother is ERICKSON on both It looks like still married to have 2 ch by Mr PARKHURST, unless Marie is a coincidence with same names for parents...it happens.
I guess Marie didn't survive, as not listed 1930 census. Greta m Melvin 1927-30. Melvin/Olive lived in L A 1926 City Directory
Had better luck with Melvin, but didn't find marriage to Greta. 5-8-1910 Melvin BLICKENSTAFF m Olive Irene PIPHER, Bisbee, Cochise Co AZ Dau Irene b 8-22-1915 Cochise AZ; m. 5-22-1931 Rex Revell SCHWENNEKER [s/o Peter David/Martha REVELL