Irma Bythiner - Auerbach
Irma Auerbach was the mother of Fritz Pfeffer's first wife.
Irma Auerbach was the mother of Vera Henriette, Fritz Pfeffer's first wife, and grandmother of Werner Pfeffer. She was married to Joseph Bythiner.
Source personal data.[1] Addresses: Milan; Amsterdam (Sept. '36, various addresses); Theophile de Bockstraat 29 I (April '37 - ± '42).[2]