Maurice Elkan was the son of Rachel Elkan-Waterman. His father was in Westerbork, and his mother asked to be sent from Vught to Westerbork with him and his sister Selma Elkan to join his father.
J. de Moei, Joodse kinderen in het kamp Vught (Vught 1999) 66
In addition, a Jokos file (number 33472) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.