Isaac Boas was a son of Alexander Boas and Rachel Koen. He married on 15 December 1915 to Clara Waterman, daughter of Meijer Waterman and Sara van Praag.
From the first marriage of his father to Catharina Walvisch, solomnized on 7 May 1873 in Amsterdam, Isaac had three more brothers: Barend (who pa…
In addition, a Jokos file (number 31785) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.