Marcus Blindeman and Ettje Frank married in 1909 in Amsterdam. They had three children: Machiel, a child that survived the war and the here mentioned Helena.
Stadsarchief Amsterdam, archiefkaart Marcus Blindeman
In addition, a Jokos file (number 12316) 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