Roza Schmidl was born in Budapest on February 26, 1874, the daughter of Heinrich Schmidl and his wife Eva, née Klein.

Ferdinand Efraim Traub came into the world on May 8, 1871 in Felsöjeszeno/Hungary in a Jewish family.

Alfred Traub was born in Berlin on July 7, 1904, the son of master tailor Ferdinand Efraim Traub and his wife Roza, née Schmidl.