Philip Witteboon was the son of Nathan Witteboon and Schoontje van Praag. He was married and had three children, among whom Schoontje. His wife survived the war.
Amsterdam Municipal Archives; record card of Philip Witteboon
In addition, a Jokos file (number 35436) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.