Salomon Jacob Simons and his wife had a son called Nico Simons. Nico Simons was unmarried. The archive of the Stichting Sieraden-Comité contains among other things a statement of the right to inheritance from 1965.
NIOD, Records Stichting Sieraden-Comité, film 580, nr 2018, file 57
In addition, a Jokos file (number 35599) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.