Mietje Jacobs was a daughter of Eliazer Jacobs and Vrouwtje Snoek. She married Samuel Kool in 1888 in Amsterdam. Stadsarchief Amsterdam, archiefkaart Mietje Jacobs
In addition, a Jokos file (number 50513) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.