Zadok Zwaap was a son of Levie Zwaap and Jannetje Slager. He married 14 May 1919 in Amsterdam to Lena Rootveld, a daughter of Samson Rootveld and Sophia Rodrigues. The couple had two children: Samson and Louis.
Zadok had siblings, who also have been killed during the Holocaust: Saartje, Mozes, Keetj…
In addition, a Jokos file (number 8771) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.