Judith Zak was a daughter of Hartog Zak and Esther de Jong. She married 16 December 1920 in Amsterdam Louis van de Kar, a son of David van de Kar and Roosje de Hoop.
Judith had another brother Abraham and a sister Dina who also have been killed during the Holocaust.
City Archive of Amsterdam, archive card of Hartog Zak and website www.wiewaswie.nl.