"Texas Deaths and Burials, 1903-1973," database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/F6TS-WM7 : 11 February 2018), Yon Slavika in entry for Aloise Slavika Sr., 11 Feb 1925; citing Cameron, reference 9974; FHL microfilm 1,481,545.
"Texas Deaths, 1890-1976," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/K3QB-RRY : 13 March 2018), Jan Slavik in entry for Aloise Slavika, 11 Feb 1925; citing certificate number 7577, State Registrar Office, Austin; FHL microfilm 2,113,843.
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DNA Connections
It may be possible to confirm family relationships with Jan 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 Jan: