Abraham Waas was a son of Isaac Waas and Henriette Velleman. He married Lea Gokkes in Amsterdam on 25 March 1931, a daughter of Salomon Meyer Gokkes and Rachel Spreekmeester.
City Archive of Amsterdam, family registration card of Isaac Waas and website www.wiewaswie.nl .
In addition, a Jokos file (number 7311) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.