Benjamin van Thijn was married to Eva Polack. He was a merchant by trade. Their third child, a daughter named Heleen Judith, was born in Westerbork transit camp on 2 May 1943.
Record of birth certificates of the Westerbork municipality, currently at the archives of Gemeente Midden-Drenthe in Beilen
In addition, a Jokos file (number 54201) 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 11891/13614).