In the 1940 census he lived with his parents, George and Mary, who were born in Czechozlovakia, brother, Andrew, born in Ohio, and other siblings, Joseph, Helen, William, John, and Edward, born in Connecticut.
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JBL4-N3R : 20 May 2014), Michael Gdovin, 08 Mar 1996; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K71R-CWR : 15 March 2018), Michael Gdovin in household of George Gdovin, Ward 4, Meriden, Meriden Town, New Haven, Connecticut, United States; citing enumeration district (ED) 5-97, sheet 1B, line 47, family 9, 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 517.