Ernst Ruben was born in Berlin on September 21, 1880, the son of Louis Ruben and his wife Erna, née Hirschberg.

Another stumbling block for Bernhard Lichtenberg is located in Tegel at the

Grete Franziska Rosenthal was born in Giessen on May 17, 1903, the daughter of Ludwig (Louis) Rosenthal, an agricultural machinery manufacturer, and his wife Bella, née Heilbrunn.