He remarried twice after Euretha died in 1919 to Florence Border (married on August 4, 1920) and Martha Keel (married on June 23, 1934).
Sources
Notes from Edna Neary
United States World War I Draft Registration Cards, 1917-1918," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KZ2D-HLV : 12 December 2014), William J Risdon, 1917-1918; citing Iowa County, Iowa, United States, NARA microfilm publication M1509 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,643,116.
Iowa, County Marriages, 1838-1934," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XJH4-GQF : 8 March 2016), Wm. J. Risdan and Bertha Maudlin Or Mandlin, 01 Jan 1894, Lincoln Twp., Iowa, Iowa, United States; citing reference p159 cn180, county courthouses, Iowa; FHL microfilm 988,207.
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DNA Connections
It may be possible to confirm family relationships with William 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 William: