Klaas Wybes Feenstra, born in Irnsum on June 25, 1815, son of Wybe Baukes Feenstra (merchant) and Romkjen Klazes Wouters (grocer), castellan and innkeeper, died in Heerenveen on January 2, 1867, aged 51 years.

Klaas was married in Sneek on May 1, 1842, at the age of 26 to
Aaltje Ulbes Heeringa (aged 27 years), born in Sneek on September 2, 1814, daughter of Ulbe Heeringa (silversmith) and Tjamke Kuipers, died in Nijehaske on April 4, 1885, aged 70 years.

• 1 : Romkje Klazes Feenstra, born in Heerenveen on May 26, 1843, died in Oudeschoot on October 30, 1917, aged 74 years.
  Romkje was married on November 5, 1868, at the age of 25 to Alle Eizinga (aged 24 years), born in Gorredijk on June 5, 1844, son of Ruurd Gerrits Eizinga (bargeman) and Bontje Hanzes de Boer, died in Heerenveen on March 24, 1942, aged 97 years.
  

• 2 : Wiebe Klazes Feenstra, born in Heerenveen on July 13, 1844, shop assistant, castellan and innkeeper, died in Heerenveen on July 15, 1880, aged 36 years.
  Wiebe was married in Leeuwarden on August 31, 1875, at the age of 31 to Elisabeth Sophia Stoett (aged 33 years), born in Leeuwarden on April 13, 1842, daughter of Frederik August Stoett (opzichter der eerste klasse bij den waterstaat and architect) and Petronella Folkertsma.
  Elisabeth was married afterwards in Schoterland on December 28, 1882, at the age of 40 to her brother in law Bernardus Clerk (aged 38 years), born in Leeuwarden on May 2, 1844, son of Pieter Clerk and Geltje Bruining, saddler. Bernardus was married before on May 17, 1872, at the age of 28 to Jitske Klazes Feenstra (aged 24 years), born in Heerenveen on April 10, 1848, daughter of Klaas Wybes Feenstra (castellan and innkeeper) and Aaltje Ulbes Heeringa, died in Heerenveen on February 27, 1882, aged 33 years.
  

• 3 : Tjamke Klazes Feenstra, born in Heerenveen on September 9, 1845, died unmarried on October 18, 1867, aged 22 years.
  

• 4 : Ulbo Klazes Feenstra, born in Heerenveen on November 26, 1846, died there on April 26, 1847, aged 151 days.
  

• 5 : Jitske Klazes Feenstra, born in Heerenveen on April 10, 1848.
  

• 6 : Kornelia Klazes Feenstra, born in Heerenveen on March 29, 1850, died in Nijehaske on February 14, 1886, aged 35 years.
  Kornelia was married in Schoterland on August 26, 1875, at the age of 25 to Johan Schurmann (aged 31 years), born in Lage in Oldenburg on August 4, 1844, son of Hinrich Schurmann and Catharina Margarete Dickers.
  

• 7 : Ulbo Klazes Feenstra, born in Heerenveen on March 15, 1852, 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.