The first wife of Siegesmund Gumpertz was Helene Schönfeld. With her he had three children: Sally, Hermann and Erna. Sally and Erna died in Auschwitz. Berta Sander was the second wife of Siegesmund Gumpertz, with whom he married circa 1900 in Breslau. They lived in Holten near Oberhausen. With her he had two children. Son Julius fell in 1920 in battle near Voerde in Wesel (Germany). A daughter survived the war. The couple lived on different addresses in Amsterdam from 1935 onwards. In November 1937 they moved to the Joodse invalide.
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