David Mok was married to Lena de Zoete. Lena Mok-de Zoete served as a witness at the wedding of her sister Rachel Mok to Benjamin Slager. The marriage was performed at Westerbork transit camp on 15 December 1942. She signed the marriage certificate.
Record of marriage certificates of the Westerbork Municipality, currently at the archives of Gemeente Midden-Drenthe in Beilen