Izak Hartog Cohen was born on 16 April 1920 in Leiden as the youngest of the two sons of David Cohen from Uden and Kaatje Cohen from Leeuwarden. His elder brother Lodewijk has survived the Holocaust. Izak Hartog Cohen married at the age of 22 in transit camp Westerbork the 16-year older Heintje Zilverberg, who was born on 14 August 1904 in Hoogeveen as daughter of Jacob Zilverberg and Roosje de Gr…