Jacob van Moppes was a son from the first marriage of Abraham van Moppes and Rachel Geertje Ephraim. After the death of his mother, his father remarried Sara Pront in 1918.
City Archive of Amsterdam, archive card of Abraham van Moppes 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.