Martha Snoek was a daugther of Hartog Snoek and Klara Zante, who both have survived the Holocaust. Martha had five other siblings: Alexander, Hijman, Samuel, (who also survived the war), Abraham and Sara.
City Archive of Amsterdam, archive card of Hartog Snoek en Samuel Snoek .
In addition, a Jokos file (number 12836) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.