Cornelis Vorstenburg, born in Harlingen on April 3, 1847, butcher and butcher's man.

Cornelis was married to
Pietje Langedijk, born circa 1859 (?).

• 1 : Frederik Vorstenburg, born in Harlingen on September 5, 1882, butcher.
  Frederik was married in Harlingen on November 14, 1907, at the age of 25 to Jantje Bijlsma (aged 21 years), born in Dedgum on January 15, 1886.
  

• 2 : Jan Vorstenburg, born in Harlingen on September 3, 1883, died before November 5, 1886, aged at most 3 years.
  

• 3 : Neeltje Vorstenburg, born in Harlingen on May 31, 1885.
  

• 4 : Jan Vorstenburg, born in Harlingen on November 5, 1886, died there on August 22, 1912, aged 25 years.
  Jan was married in Harlingen on May 30, 1907, at the age of 20 to Aafke Feenstra (aged 16 years), born in Harlingen on August 2, 1890, daughter of Auke Feenstra and Doutzen Windsma, died there on May 1, 1952, buried there, aged 61 years.
  Aafke was married afterwards in Harlingen on December 11, 1913, at the age of 23 to Tjerk Tichelaar (aged 28 years), born in Harlingen on January 7, 1885, son of Lodewijk Tichelaar (worker and workman) and Eelkje Geldersma, casual labourer and 2nd fireman gasworks, died in Harlingen on August 29, 1979, buried there, aged 94 years.
  

• 5 : Aafke Vorstenburg, born in Harlingen on March 2, 1889.
  

• 6 : Teuntje Vorstenburg, born in Harlingen on March 15, 1892.
  

• 7 : Jeltje Vorstenburg, born on March 15, 1892.
  

• 8 : Rinske Vorstenburg, born in Harlingen on July 19, 1893.
  

• 9 : Grietje Vorstenburg, born in Harlingen on May 12, 1895.