Henriette Slagter was a daughter of Samuel Slagter and Jeannette Aronius. She married Jacob van Moppes in Amsterdam on 4 November 1931, a son of Abraham van Moppes and Rachel Geertje Ephraim.
City Archive of Amsterdam, archive card of Samuel Slagter and website www.wiewaswie.nl
In addition, a Jokos file (number 51106) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.