"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XM2H-1HY : accessed 11 September 2017), Sylvia R Simmons in household of Ralph L Simmons, Washington, Washington, District of Columbia, United States; citing enumeration district (ED) ED 386, sheet 3A, line 9, family 89, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 304; FHL microfilm 2,340,039.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K7F6-L8C : accessed 11 September 2017), Sylvia Simmond in household of Ralph Simmond, Sanitary District, Election District 7, Montgomery, Maryland, United States; citing enumeration district (ED) 16-19, sheet 15A, line 29, family 329, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 1554.
Obituary for Fletcher LeRoy Houck Jr. (Sylvia's husband) published in the Capital Gazette on Sunday, January 16, 2011. Accessed at GenealogyBank.com, free index available at FamilySearch.org.
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DNA Connections
It may be possible to confirm family relationships with Sylvia by comparing test results with other carriers of her mitochondrial DNA.
However, there are no known mtDNA test-takers in her direct maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Sylvia: