Alma Jülich was born into a Jewish family in Duisburg-Ruhrort on June 13, 1880.

Martha Neff was born in Prague on May 9, 1890, into a Jewish family.

Rosa Lang was born in Berlin on September 6, 1874, the daughter of Adolf Wilhelm Lang, a master tailor, and his wife Lina, née Wollstein.

Adolf Aron Nathanson was born in Nauen on June 16, 1859, the son of the merchant Joel Nathanson and his wife Heimchen née Lagrand.