Jan Feenstra, onderzoeker TNO, gepensioneerd, born in Makasser (Indonesië) on July 5, 1921, died in Steenwijkerwold on February 18, 2002, buried there on February 22, 2002, aged 80 years, son of Mr. Gerrit Feenstra (lid Raad van Justitie te Soerabaja) and Charlotte Ripassa.

Jan was married in Velsen on November 1, 1962, at the age of 41 to
Elizabeth Willie Marie Terpstra (aged 37 years), bibliothecaresse, na haar trouwen huisvrouw, born in 's-Gravenhage on August 2, 1925, daughter of Anne Terpstra (bouwkundige bij oa Hoogovens mrt 1939-1958.) and Geertruida Elisabeth Schnoor.

• 1 : Maaike Feenstra, docente frans, born in 's-Gravenhage on May 20, 1963.
  Maaike was married in Leek on August 30, 1997, at the age of 34 to Johannes Andries Maring (aged 38 years), huisarts in Tolbert, born in Rotterdam on April 15, 1959, son of Herman Maring (hoofdcommies rijksbelastingen, gepensioneerd) and Jannetje van den Broek (docente EHBO).
  

• 2 : Wietse Feenstra, student filosofie, grafisch ontwerper and ambtenaar Min. van Landbouw, born in Naaldwijk on January 5, 1965.
  Wietse was married on December 1, 2004, at the age of 39 to Fairy Sylvia Cooke, geadopteerd in Arnhem on July 25, 1970.