Philip Schaap was a son of Willem Schaap and Elisabeth Groen. He married 26 January 1938 in Amsterdam to Rebecca Vieijra, daughter of Haim Joseph Vieijra and Eva Abraham.
City Archive of Amsterdam, archive card of Philip Schaap.
In addition, a Jokos file (number 12560) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.