Maurits Eduard Manuskowski was married to Milly Koekoek. On 24 december 1943 their second child Jiska was born in the transit camp Westerbork. Since the father was unable to register the birth 'because of absence', it was registered by the gynaecologist Herman Heymans.
Record of birth certificates of the Westerbork municipality, currently at the archives of Gemeente Midden-Drenthe in Beilen
In addition, a Jokos file (number 133) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.