Salomon Loonstijn was a son of Joseph Loonstijn and Eva Vos. He married in Amsterdam, together with his brother Simon on 20 October 1924 to Sara Sluijzer.
City Archive of Amsterdam, archive card of Joseph Loonstijn .
In addition, a Jokos file (number 32151) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.