Pete T Lieuwen, 81 (head, widowed, Holland Netherlands)
Frank A Lieuwen, 53 (son, single, Iowa)
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KMT4-5K5 : accessed 5 December 2015), Pete T Lieuwen, Dumont, Pittsford Township, Butler, Iowa, United States; citing enumeration district (ED) 12-22, sheet 2A, family 36, NARA digital publication T627 (Washington, D.C.: National Archives and Records Administration, 2012), roll 1143.