 Jacobus "Koos" Dijkgraaf, son of Marinus Jacob Dijkgraaf and Thona Walkier.Born 24 May 1905 Rotterdam, died 08 Sep 1982 Rotterdam, 77 years. Occupation: bankwerker/stoker Rijkswerkplaats/hulpagent van politie Married 27 Mar 1929 Rotterdam Divorced 17 Feb 1948 Rotterdam (18 years married) from:  Pieternella Lina "Pie" van Geleijnse, daughter of Johannis van Geleijnse and Pieternella Lena Boot.Born 10 Mar 1905 Zierikzee, died 06 May 1984 Apeldoorn, 79 years. Occupation: huishoudster Children: 3. Marinus Jacob DijkgraafBorn 14 Aug 1929 Rotterdam, died 07 Nov 1998 Rotterdam, 69 years, buried 12 Nov 1998 Rotterdam, Begraafplaats Crooswijk. Occupation: betonijzerwerker 4. Clement DijkgraafBorn 29 Jul 1937 Rotterdam, died 11 Jun 1971 Rotterdam, 33 years. Occupation: matroos grote vaart | |||
| 2nd marriage Jacobus "Koos" Dijkgraaf, son of Marinus Jacob Dijkgraaf and Thona Walkier. Married 14 Apr 1948 Rotterdam (22 years married) to: Maria Magdalena van der Heijdt, daughter of Jacobus Marinus van der Heijdt and Dina Behage.Born 09 Jul 1915 Rotterdam, died 03 Jan 1971 Rotterdam, 55 years | |||