"Deutschland, Baden, Erzbistum Freiburg, katholische Kirchenbücher, 1678-1930," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QP3X-S29S : 14 May 2018), Georgii Roos in entry for Joannes Simon Roos, ; citing Baptism, Neckarhausen, Mannheim, Baden, Deutschland, , Erzbischöfliches Archiv Freiburg (Archbishop's Archives), Germany.
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DNA Connections
It may be possible to confirm family relationships with Johann 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 some percentage of DNA with Johann: