Elwood Swanson b 3 May 1893 Oakland CA Chauffeur H C. Capwell Clay St.
I think this is him.
1900 United States Federal Census about Fred B Swanson Name: Fred B Swanson Home in 1900: Washington, Alameda, California Age: 48 Birth Date: Feb 1852 Birthplace: Norway Race: White Gender: Male Immigration Year: 1892 Relationship to Head of House: Boarder Father's Birthplace: Norway Mother's Birthplace: Norway Marital Status: Single Residence : Emeryville City, Alameda, California Most likely, Elwood was his stepson who took his name.
I would contact the Alameda courthouse and ask them to do a marriage search.
1910 census, Oakland Ward 5, Alameda, California Charlotte Swanson 56 Frank Sebran 41 Joseph Sebran 38 John Sebran 32 Elwood Swanson 14 Charles Naughton 50 Manuel Abalia 24 John Moore 49 Frank Logan 80
1920 census, Oakland, Alameda, California Otto Saatengue 36 Woodrow Saatengue 7 John Saatengue 5 Helen Saatengue 2 3/12 Charlotte Saatengue 2 3/12 Joseph Sebrian 46 brother Raymond F Sebrian 7 Evelyn Sebrian 5 Frances Sebrian 4 Charlotte Swanson 70 mother CA f KS m CA