Jacob de Jong, merchant by profession, was a son of David de Jong and Sara Cohen and was born in Haarlem on 30 April 1910. He married on 24 August 1942 in the synagogue of Haarlem to Saartje Wijtvliet, who was born on 14 May 1920 in Rotterdam as daughter of Alida Velleman and Everhardus Wijtvliet. Jacob de Jong had an eight-year elder sister Maria, who was married to the dealer in woolen goods Moz…