He first married Louise Boehmer. They had one child who was born shortly before Lousie died. He later married Irene Heald.
Sources
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M213-5NM : accessed 20 April 2019), Harry C Fischer in household of Henry Fischer, St Louis Ward 1, St Louis (Independent City), Missouri, United States; citing enumeration district (ED) ED 11, sheet 14A, family 296, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 811; FHL microfilm 1,374,824.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XHVM-KBT : accessed 29 November 2022), Harry C Fischer, St Louis (Districts 1-250), St Louis (Independent City), Missouri, United States; citing enumeration district (ED) ED 90, sheet 3A, line 32, family 64, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1243; FHL microfilm 2,340,978.
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DNA Connections
It may be possible to confirm family relationships with Harry 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 Harry: