See for more information on the Grunwald family: J. D. Kila, De Kille aan het Marsdiep: anderhalve eeuw Joodse gemeenschap in Den Helder (Den Helder 1999).
In addition, a Jokos file (number 9774) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.
Person is in the National Database of Victims of Persecution