Nathan Waas was a son of Isaac Waas and Henriette Velleman. He married Annaatje Reindorp on 17 September 1924 in Amsterdam, a daugther of Hartog Reindorp and Esther Croese.
City Archive of Amsterdam, family registration card of Isaac Waas and website www.wiewaswie.nl.
In addition, a Jokos file (number 7307) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.