Mozes Crost was married to Julie Margot Kargauer. Their fourth child, the daughter Lydia Ellen, was born on 29 July 1943 in Westerbork transit camp.
Record of birth certificates of the Westerbork municipality, currently at the archives of Gemeente Midden-Drenthe in Beilen
In addition, a Jokos file (number 31045) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.