Charles's wife Agnes is listed as widowed on the 1940 census.
Sources
"United States Census, 1900," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M3KF-NPL : accessed 23 Mar 2014), Charles W Houch in household of Charles H Houch, Precinct 11 Baltimore city Ward 13, Baltimore, Maryland, United States; citing sheet 7A, family 110, NARA microfilm publication T623, FHL microfilm 1240613.
Find A Grave Memorial# 90539982
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DNA Connections
It may be possible to confirm family relationships with Charles 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 Charles: