Mietje Roest was a daughter of Meijer Marcus Roest and Jansje van Staveren. She was the widow of Ferdinand de Leef.
Stadsarchief Amsterdam, archiefkaart Mietje Roest
In addition, a Jokos file (number 20895) on this person is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.