William was born in 1821. He passed away in 1901. William is mentioned in son Chester Allen's death record of 15 May 1936
"Ohio, County Marriages, 1789-2013," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XZXV-S86 : 26 August 2019), William Allen and Hannah Ellsworth, 17 Oct 1861; citing Marriage, Lake, Ohio, United States, 339, Franklin County Genealogical & Historical Society, Columbus; FHL microfilm.
"Michigan Death Certificates, 1921-1952," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:KF4R-WJ3 : 13 March 2018), William Allen in entry for Chester A Allen, 15 May 1936; citing Pinconning, Bay, Michigan, United States, Division for Vital Records and Health Statistics, Lansing; FHL microfilm 1,973,177.
"Find A Grave Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QV2G-2TZM : 13 December 2015), William Allen, 1901; Burial, Millington, Tuscola, Michigan, United States of America, Newton-Compau Cemetery; citing record ID 74653303, Find a Grave, http://www.findagrave.com.
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