Bertha Mathilda de Vries was a daughter of Aron de Vries and Naatje Kaffe. She married Jacob Henriques de Souza in 1889. He passed away in 1911. They had two children.
Stadsarchief Amsterdam, archiefkaart Bertha Mathilda de Vries
In addition, a Jokos file (number 4806) on this person is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelij…