Barend Waas was a son of Asser Leman Juda Waas and Rachel Schouten. He married in Amsterdam on 14 September 1898 to Schoontje Roe, daughter of Mozes Roe and Klaartje Cornalijnslijper. The couple had two children: Lehman and Klara.
website www.wiewaswie.nl.
In addition, a Jokos file (number 11355) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.