Sonja, Here is Willis in the 1920 Census, though I am not seeing them in any other yet.  Also, his entry in the CA Death Index.  Hope this helps a little?  JAL 1920 US CENSUS Sanger 7th Township of Fresno.  Address is 257 M Street. Two Households at this address.  Owns mortgage on House.  Date is 11 January 1920. Herman H Hanke Head 33    MWM  CA CA CA   Farmer/Vineyard Farm Eliza M Hanke    Wife 32   FWM    CA TX CA Willis H Hanke      Son 2.8  MWS   CA CA CA California Death Index, 1940-1997 Name Death Date Death Place SocialSecurityNumber Gender Birth Date Birthplace Mother's Maiden HANKE, WILLIS HERMAN 28 Feb 1987 SAN JOAQUIN 547076025 MALE 26 Apr 1917 CALIFORNIA HILL