Fredrik Polak, who worked in a department store, was a son of Machiel Polak and Rachel Morpurgo. On 24 August 1938 he married Sara Bronkhorst in The Hague. In 1940 he was mobilised. Fredrik died in Mauthausen on 8 October 1941, 34 years old. Sara was murdered in Auschwitz on 30 September 1942; she was 28.