Joachim de Groot was the son of David Levie de Groot and Aaltje Blog. He married to Betsie Gazan, the daughter of Coenraad Gazan and Flora Hirschel, on 2nd April 1924 in Amsterdam.
Addition of a visitor of the website
In addition, a Jokos file (number 53098) 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 4429/5087).