His spouse was Austa or Osta Nesia Jacobs, ca. 1875- 7 March 1945. She is listed as "widowed" in the 1930 US Census, so he must have died before then.
1880 US Census for Whitman, Washington:
L C Jacobs Self M 38 New York, United States
N L Jacobs Wife F 37 Ohio, United States
May W Jacobs Daughter F 11 Kansas, United States
Ralph Jacobs Son M 8 Kansas, United States
Inez Jacobs Daughter F 5 Nebraska, United States
Roy Jacobs Son M 2 Washington, United States
M A Clark Mother-in-law F 76 New York, United
1910 US Census for Yuma, Arizona:
Ralph C Jacob 38
Austa P Jacob 35
Elizabeth L Jacob 7
Sybel M Jacob 6
1920 US Census for Yuma, Arizona:
Ralph C Jacob 48
Austa P Jacob 45
Elizabeth L Jacob 17
Sybil Jacob 15
Ralph A Jacob 8
Lois M Jacob 2
Sources
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MXTF-NXL : 15 July 2017), Ralph Jacobs in household of L C Jacobs, Farmington, Whitman, Washington, United States; citing enumeration district ED 56, sheet 356D, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 1398; FHL microfilm 1,255,398.
"California Great Registers, 1866-1910," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:VNN8-17K : 8 December 2017), Ralph C Jacobs, 17 Oct 1894; citing Voter Registration, Santa Maria, San Diego, California, United States, county clerk offices, California; FHL microfilm 977,095.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MVVH-1Z3 : accessed 28 June 2018), Ralph C Jacob, Precinct 2 1/2, Yuma, Arizona, United States; citing enumeration district (ED) ED 129, sheet 15A, family 240, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 41; FHL microfilm 1,374,054.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MCRT-R1X : accessed 28 June 2018), Ralph C Jacob in household of Fred L Ingraham, Yuma, Yuma, Arizona, United States; citing ED 132, sheet 5B, line 90, family 124, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 51; FHL microfilm 1,820,051.
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DNA Connections
It may be possible to confirm family relationships with Ralph by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Ralph: