"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MNW2-32M : 12 August 2017), Edward D Clark in household of Soloman Clark, Little Rock, Pulaski, Arkansas, United States; citing enumeration district ED 141, sheet 2...
"Minnesota, County Deaths, 1850-2001," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QPHZ-F55Y : 1 February 2019), Solomon F Clark in household of Edward Otis Clark, Rochester Township, Olmsted, Minnesota, United States; citing Death,...
"Minnesota Deaths and Burials, 1835-1990," database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/FDQJ-HTG : 10 February 2018), Edward Otis Clark, 24 Jun 1928; citing Rochester, Olmsted, Minnesota, reference 10426; FHL microfilm 2,223,147.
It may be possible to confirm family relationships with Edward by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: