Jacob Katwijk was the youngest of the two children of Abraham Katwijk and Betje Bierman. He was born on 24 May 1922 in Amsterdam and was working as an apprentice diamond worker. He was unmarried.
Jacob had an elder sister, Sara, who got married in December 1940 to the non-jewish Hendrik Frans Sonnenschein and has survived the war. At the other hand, Jacob has been caught during the raid of 11 June…