Marcus de Vries married in Amsterdam on 28 January 1942 to Henriette van Staveren, a daughter of Samuel van Staveren and Helena van Emrik. City Archive of Amsterdam, archive card of Henriette van Staveren.
In addition, a Jokos file (number 50066) 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 bank (L-claim, number 12483/15899).