Betje van Moppis was a daughter of Isaak van Moppis and Mietje Garan. She married Ruben Fuldauer in 1915 in Dinxperlo. They divorced in 1925.
Stadsarchief Amsterdam, archiefkaart Betje van Moppis
In addition, a Jokos file (number 3446) on this person is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.