"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VRTL-PGS : 26 July 2019), Lois Lucille Brown in household of Whelden J Brown, Tract 9, Portland, Portland City Election Precinct 116, Multnomah, Oregon, United States; citing enumeration district (ED) 37-167, sheet 5A, line 13, family 106, 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 3388.
It may be possible to confirm family relationships with Lois by comparing test results with other carriers of her ancestors' 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 DNA with Lois: