Ada Lea Rosa Löwenstein was born into a Jewish family in Oberhausen on October 16, 1911.

Lina (Celina) Braun was born in Posen on December 18, 1870, the daughter of Tobias Braun and his wife Henriette née Türk.

Miriam Senta Brenner was born in Leipzig on October 8, 1886, the daughter of Heinrich Brenner and his wife Fanny née Beckmann.