Jacob Leonard van Amerongen was married to Alida de Paauw. He was surveyor at a life insurance company. Their third child, daughter Heleen Shulamit, was born in Westerbork transit camp on 16 October 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 12572) 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 197/8775).