 Name Withheld, son of Pieter "Piet" Dijkgraaf and Jannigje Plonia "Jans" van Loon. PRIVACY FILTERMarried to:  Wilhelmina "Wil" Heikoop, daughter of Willem Heikoop and Name Withheld.Born 31 Jul 1946 Moordrecht, died 05 Feb 1990 Moordrecht, 43 years Children: 1. Name Withheld PRIVACY FILTER | |||