Louis Ephraim was a son of Salomon Ephraim and Claartje Hoed. He married in Amsterdam on 22 August 1934 to Sara Roos.
City Archive of Amsterdam, archive card of Louis Ephraim.
In addition, a Jokos file (number 16934) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.