 Jacobus "Koos" Dijkgraaf, son of Marinus Jacob Dijkgraaf and Thona Walkier.Born 24 May 1905 Rotterdam, died 08 Sep 1982 Rotterdam, age 77 years. Occupation: bankwerker/stoker Rijkswerkplaats/hulpagent van politie Married 27 Mar 1929 Rotterdam, age 23 years Divorced 17 Feb 1948 Rotterdam (married 18 years) from:  Pieternella Lina "Pie" van Geleijnse, age by marriage 24 years, daughter of Johannis van Geleijnse and Pieternella Lena Boot.Born 10 Mar 1905 Zierikzee, died 06 May 1984 Apeldoorn, age 79 years. Occupation: huishoudster Children: 3. Marinus Jacob DijkgraafBorn 14 Aug 1929 Rotterdam, died 07 Nov 1998 Rotterdam, age 69 years, buried 12 Nov 1998 Rotterdam, Begraafplaats Crooswijk. Occupation: betonijzerwerker 4. Clement DijkgraafBorn 29 Jul 1937 Rotterdam, died 11 Jun 1971 Rotterdam, age 33 years. Occupation: matroos grote vaart | |||
| 2nd marriage Jacobus "Koos" Dijkgraaf, son of Marinus Jacob Dijkgraaf and Thona Walkier. Married 14 Apr 1948 Rotterdam, age 42 years (married 22 years) to: Maria Magdalena van der Heijdt, age by marriage 32 years, daughter of Jacobus Marinus van der Heijdt and Dina Behage.Born 09 Jul 1915 Rotterdam, died 03 Jan 1971 Rotterdam, age 55 years | |||