Marianna Ritmeester was a daughter of Joseph Ritmeester and Aaltje Brander. She married 12 December 1923 to Coenraad Koopman, son of Levie Koopman and Deborah Vogel.
City Archive of Amsterdam, archive card of Joseph Ritmeester and website www.wiewaswie.nl .
In addition, a Jokos file (number 35836) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.The Jokos file reveals that a claim was lodged for compensation for valuables surrendered to the Lippmann-Rosenthal looting …