Heintje Walvis was a daughter of Zacharias Walvis and Fijtje Posener. She married in Amsterdam on 18 August 1920 to Salomon Walvis, son of Levie Walvis and Grietje Italiaander.
City Archive of Amsterdam, archive card of Heintje Walvis and website www.wiewaswie.nl .
In addition, a Jokos file (number 51379) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.