Hermine Fischer was a daughter of Alouis Fischer and Anna Gans. She was married to Joseph Mozes Son from Rotterdam, a son of Mozes Joseph Son and Henrietta Bosman. The couple had three children: Maurice Joost, Alouis Herman and Henriette Anne Clara, who has surivived the Holocaust.
Joseph Mozes Son passed away in Rotterdam on 15 March 1927 and his widow Hermine Fischer lived in in the family of her son Maurice Joost at Nieuwe Binnenweg in Rotterdam, untill she died there on 22 May 1940.
City Archive of Rotterdam, family registration cards of Joseph Mozes Son and Maurice Joost Son.