Frederick married Lucinda Eleanor Bates on 30 Jun 1918 in Waushara County, Wisconsin. They had three children, Keith Garland, Reid Alan, and one who died as an infant.
Sources
"Wisconsin State Census, 1905," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MMQV-K4D : accessed 16 Dec 2012), Charley Decker in household of Charles Decker, Warren, Waushara, Wisconsin.
"United States Census, 1910," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MP2L-GCX : accessed 16 Dec 2012), Charles Decker in household of Charles Decker, Warren, Waushara, Wisconsin; citing sheet 4B, family 83, NARA microfilm publication T624, FHL microfilm 1375751.
"United States Census, 1920," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MF2X-TSV : accessed 16 Dec 2012), Charles J Decker in household of Fred J Decker, , Waushara, Wisconsin; citing enumeration district (ED) , sheet 7B, family 131, NARA microfilm publication T625, FHL microfilm 1822022.
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DNA Connections
It may be possible to confirm family relationships with Frederick by comparing test results with other carriers of his ancestors' Y-chromosome or 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 Frederick: