Aaron de Jong was a son of Philip de Jong and Sara Snijders. He married Engeltje Leliveld in 1918 in Amsterdam.
Stadsarchief Amsterdam, huwelijksakte 20-3-1918 (nr. 188)
In addition, a Jokos file (number 33238) on this person 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 5805/3857).