Ulbo Klazes Feenstra, born in Heerenveen on March 15, 1852, son of Klaas Wybes Feenstra (castellan and innkeeper) and Aaltje Ulbes Heeringa, postoffice clerk, stationchef (1882) and stationmaster, died in Houten on November 30, 1900, aged 48 years.
Ulbo was married in Sneek on December 13, 1877, at the age of 25 to
Tytje Reinouts van Haga (aged 21 years), born in Sneek on January 4, 1856, daughter of Wybren Reinouts Petrus' van Haga (merchant, tabaksfabrikant (1876/1882), tabakskerver (1885) and tobacco manufacturer) and Baukje Gaastra, died in Utrecht on July 2, 1898, aged 42 years.
From this marriage:
- 1 : Baukje Feenstra, born in Sneek on January 6, 1879, collectrice Staatsloterij, died in Goningen on January 26, 1960, aged 81 years.
- 2 : Nicolaas Feenstra, born in Udenhout on March 14, 1882, 2e luitenant der infanterie and manager flour factory, died in Leeuwarden on June 6, 1960, aged 78 years.
Nicolaas was married in Leeuwarden on September 22, 1910, at the age of 28 to Marie Vosman (aged 22 years), born in Heerenveen on September 2, 1888, daughter of Hermanus Albertus Vosman (miller) and Eisina Palsma, died in Groningen on June 10, 1942, aged 53 years.
- 5 : Wiebe Klaas Feenstra, born in Houten on May 27, 1888, died in Tjimahi on June 26, 1945, buried in Cimahi [NOI], aged 57 years.
Wiebe was married in Steenwijk on September 8, 1915, at the age of 27 to Clara Geertruida Godefroij (aged approximately 25 years), born in Steenwijk circa 1890, daughter of Jan Godefroij and Jacoba Adriana Willemina Piepers.
- 6 : Catharina Johanna Feenstra, born in Utrecht on February 22, 1890, died in Batavia on November 11, 1923, aged 33 years.
Catharina was married in Amsterdam to Ferdinand van Haastert, born in Batavia on September 30, 1890, son of Frederik George van Haastert and Annette Swart, died on March 17, 1940, aged 49 years.
Ferdinand was married afterwards in Batavia on March 21, 1929, at the age of 38 to N.N..
- 7 : Alida Feenstra.
Alida was married to Heikens.