Isaäc de Haan and Jetje de Vriend married in 1897 in Amsterdam.
They had nine children, among whom Leentje, Josef, Anna (who died at a young age), Aron (who died at a young age), Anna and Rachel.
Stadsarchief Amsterdam, archiefkaart Isaäc de Haan
In addition, a Jokos file (number 14598) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.