Albert Falk was born into a Jewish family in Beckum, Westphalia, on February 17, 1885. He studied medicine in Freiburg and Munich, passed the state examination in 1909 and received his doctorate with a thesis on the therapy of tuberculosis. He fought in World War I as an officer and became seriously ill at the end of the war. He married the physician Erna Levi, and their children were born in Berlin: Werner in 1923 and Renate in 1925. The family lived from 1920 onwards at Hauptstraße 30, where Albert Falk also had his practice.

Wulf Fajgenbaum was born on July 5, 1896 in Wyrusembi/County of Sokolow/Galicia into a Jewish family with many children; he had six siblings.

Max Fabisch was born on March 30, 1870 in Strelno (today:Strzelno/Poland) as the son of the textile merchant Philipp Fabisch and his wife Therese née Pick.

Jenny Cheim alias Katz was born in Berlin on July 22, 1872, the daughter of Moses Moritz Cheim alias Katz and his wife Reize Rieke née Bab.

Hanni Fabian was born in Berlin on May 20, 1901, the second oldest daughter of the merchant Gerson Fabian and his wife Jenny née Cheim alias Katz.