Some debate about whether John Henry (Johann Heinrich) was born to Caspar Heckman Jr. or Caspar Heckman III.. I believe it's Caspar Jr. as if it were the younger Henry would have been born out of wedlock.
Biography
Henry was born to May 11, 1785 to Caspar Heckman Jr. and Elizabeth Schmidt. He married Dorothea Lohnes Jan 9, 1810. They had the following children; [1]
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DNA Connections
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.
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 Henry: