Elisabeth Zak was unmarried. She had three other brothers and two sisters: one brother survived the war, however not his wife Anna Italiaander. Her brothers Michiel and Simon and her sisters Rachel and Judith have been killed too during the Holocaust.
City Archive of Amsterdam, archive card of Jacob…
In addition, a Jokos file (number 32761) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.