Salomon de Jong was a son of Marcus Salomon de Jong and Rachel Koen. He married 20 December 1927 in Bialystok (Poland) Szosza Mandelbaum from Grodno. The couple had a daughter, born in Amsterdam in November 1933, who has survived the Holocaust.
Salomon had a sister who has survived the Shoah too and…
In addition, a Jokos file (number 61081) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.