Abraham Waterman was a son of Alexander Waterman and Marianne van Velzen. Alexander (who passed away in 1937) and Marianne (who have survived the war) had five children of whom Isidor, Schoontje and Emanuel have survived the Holocaust too, but not Salomon and he himself.
Abraham married in Amsterdam…
In addition, a Jokos file (number 11035) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.