Jack was the son of Omer Haase and Mabel (Sosbe) Sering.
He married Betty Harwood. They had at least two children.
Burial: Oak Hill Grant Avenue Cemetery, Crawfordsville, Montgomery County, Indiana, USA
Sources
"United States Census, 1930," database with images, FamilySearch: accessed 13 September 2015, Jack Haase in household of Omer Haase, Crawfordsville, Montgomery, Indiana, United States; citing enumeration district (ED) 0025, sheet 16A, family 374, line 22, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 620; FHL microfilm 2,340,355.
"United States Census, 1940," database with images, FamilySearch: accessed 13 September 2015, Jack A Haase in household of Omer Haase, Ward 4, Crawfordsville, Union Township, Montgomery, Indiana, United States; citing enumeration district (ED) 54-25, sheet 2A, family 23, NARA digital publication T627 (Washington, D.C.: National Archives and Records Administration, 2012), roll 1080.
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DNA Connections
It may be possible to confirm family relationships with Jack by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Jack: