Izak Hartog Cohen was born 26 February 1903 in Leiden. He was the third of the seven children of Hartog Cohen from Leeuwarden and Marianne Sitters From Gorinchem. His father passed away already on 24 May 1930 in Leiden, but his mother was killed during the Holocaust, just as all her other children and their families, namely Margaretha, Elisabeth, Salomon, Berend Gustaaf, Herman Samuel and Ester Co…