 Derk Jan "Dirk" Dijkgraaf, son of Cornelis "Coen" Dijkgraaf and Derkje van Assen.Born 07 Oct 1920 Heerde, died 06 Aug 2005 Sliedrecht, age 84 years, buried 11 Aug 2005 Sliedrecht, Algemene Begraafplaats. Occupation: chef werkplaats Married 21 Jan 1953 Rotterdam, age 32 years (married 45 years) to:  Theodora "Dora" Sonneveld, age by marriage 32 years, daughter of Cornelis Sonneveld and Geertruida Johanna Cornelia "Truida" Lancee.Born 22 May 1920 Rotterdam, died 08 Dec 1998 Sliedrecht, age 78 years, buried Sliedrecht, Algemene Begraafplaats | |||