In June 13, 1858, the Mississippi steamer "Pennsylvania" was destroyed by an explosion. Onboard was Henry Clemens, (brother of Samuel L. Clemens, aka Mark Twain) who died of inhaled stream and severe burns a few days later. Samuel had secured the job on the doomed steamer for Henry.
"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MDZX-ZZL : 29 October 2019), Henry Clemens in household of Jane Clemens, Hannibal City, Marion, Missouri, United States; citing family 709, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
Find A Grave, database and images (https://www.findagrave.com : accessed 16 December 2019), memorial page for Henry Clemens (13 Jul 1838–21 Jun 1858), Find A Grave: Memorial #21751, citing Mount Olivet Cemetery, Hannibal, Marion County, Missouri, USA ; Maintained by Find A Grave (contributor 8) .
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It may be possible to confirm family relationships with Henry by comparing test results with other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: