Isaäc de Haan was a son of Joseph de Haan and Elisabeth Elsas.
He married Sara van Moppes in 1936 in Amsterdam.
Stadsarchief Amsterdam, archiefkaart Isaäc de Haan
According to a list with shops of Jewish owners, compiled by the Amsterdam police in 1940, this family had a fish-and fruit shop, address: Holendrechtstraat 47 in Amsterdam.
Abstracts of the police archives which are currently at the Amsterdam municipal archives
In addition, a Jokos file (number 9947) on this household is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.