"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M3GL-WQR : accessed 10 June 2019), Allen Ellis in household of Miranda Ellis, Justice Precinct 3 (election precinct 15), Harrison, Texas, United States; citing enumeration district (ED) 42, sheet 11A, family 200, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,643.
"Texas Deaths, 1890-1976," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K78B-5D8 : 13 March 2018), Howard Allen Ellis, 10 Jun 1965; citing certificate number 39462, State Registrar Office, Austin; FHL microfilm 2,117,827.
It may be possible to confirm family relationships with Howard by comparing test results with other carriers of his ancestors' Y-chromosome or 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 DNA with Howard: