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, Keetje and Mietje.
website www.wiewaswie.nl.