Frank was born in 1923 in Frankfurt an der Oder to Erich and Alice Auerbach who moved to Wuppertal, where Erich's parents lived, when Franz was four.

Franz's grandfather, who died in 1929, owned the four story house built in 1892 and his family occupied one floor. At the back of the house he had a coffee roasting factory.

Franz's mother Alice was born in Berlin and qualified as a dentist in 1911. However with Hitler's rise to power she was sacked from the municipal dental clinic in 1933. She then worked as a seamstress in a clothing factory and was nearly 60 when Franz earned sufficient money for her to be able to retire.

Source

Http://www.goethe.de/ins/za/pri/jue/bfx/en1586238.htm