Otto Mossmann was born on March 8, 1897 in Burghaslach/Middle Franconia, the son of Gustav Mossmann and his wife.

Helene Mosler was born on November 7, 1884, the second and last daughter of the Jewish cloth merchant Eduard Mosler in Hirschberg im Riesengebirge, Am Markt 38 or Warmbrunnerstraße 20, and his wife Cäcilie. Her older sister Else Elisabeth, born on June 24, 1875, married her cousin, the physician Dr. Siegfried Freund, in 1894 and moved with him to Berlin. Helene Mosler became a nurse and after World War I moved with her parents to Sponholzstrasse 53-54 in Berlin-Friedenau, where she remained even after her parents died.

Another stumbling block for Johanna Klum is located at Heilbronner Straße 5 in Berlin-Schöneberg.

Martha May was born in Breslau on January 24, 1862, the daughter of the bookseller Robert May and his wife Rosalia, née Sternberg.

Alfred Moses was born in Berlin on March 7, 1892, the son of Simon Moses and his wife Martha, née May.