Robert was the son of Lawrence Williamson and Hilda Hollenbeck.
Sources
"United States Census, 1930," index and images, FamilySearch: accessed 2 June 2015), Robert B Williamson in household of Lawrence Williamson, Downey, Los Angeles, California, United States; citing enumeration district (ED) 0925, sheet 3A, family 49, line 1, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 126; FHL microfilm 2,339,861.
"United States Census, 1940," index and images, FamilySearch: accessed 2 June 2015, Robert Williamson in household of Lawrence Williamson, Tract 497, Montebello, Montebello Judicial Township, Los Angeles, California, United States; citing enumeration district (ED) 19-399, sheet 61B, family 114, NARA digital publication T627 (Washington, D.C.: National Archives and Records Administration, 2012), roll 238.
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DNA Connections
It may be possible to confirm family relationships with Robert by comparing test results with other carriers of his ancestors' Y-chromosome or 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 Robert: