"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KQZN-9M5 : accessed 10 January 2018), Lawrence Bloemker in household of Madaline Bloemker, Ward 16, Philadelphia, Philadelphia City, Philadelphia, Pennsylvania, United States; citing enumeration district (ED) 51-270, sheet 11A, line 40, family 229, 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 3695.
If the above is correct, then this is likely his mother, with connection to her husband (his father):
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:VS2Y-Q61 : 20 May 2014), Lawrence Bloemker, Oct 1973; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
"United States, GenealogyBank Obituaries, 1980-2014," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QKT3-SK4W : accessed 10 January 2018), Lawrence J Bloemker Sr in entry for Mary Catherine Mcdonnell Bloemker, Hagerstown, Maryland, United States, 04 Nov 2006; from "Recent Newspaper Obituaries (1977 - Today)," database, GenealogyBank.com (http://www.genealogybank.com : 2014); citing Herald-Mail, The, born-digital text.