He had a short affair with Marie Catharina Hilbrecht, which resulted in a son, my grandfather Karl Heinz Hilbrecht.
At the birth of my grandfather 1911 and until 1923, Theodor lived on Chausseestrasse 4 in Berlin Germany. Since then I lost track of him.
Sources
Information is found in the birth certificate of Karl Heinz Hilbrecht
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DNA Connections
It may be possible to confirm family relationships with Theodor 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 Theodor: