Jan Cornellis, born in Warffum on March 14, 1709, died there on May 17, 1771, aged 62 years.

Jan was married in Warffum on March 25, 1736, at the age of 27 to
Anje Jans (aged 20 years), born in Warffum, christened there on April 21, 1715, died there on May 18, 1792, aged 77 years.

• 1 : Bauke Jans, born in Warffum, christened there on December 2, 1742, died De Horne (gem Uithuizermeeden) on November 30, 1807, aged 64 years.
  Bauke was married in Warffum on April 9, 1765. She was married in Uithuizermeeden on April 21, 1765 in church, at the age of 22 to Cornelis Harms (aged 27 years), landbouwer, born in Uithuizermeeden in September 1737, christened there on October 6, 1737, died there on September 30, 1806, aged 69 years, son of Harm Cornelis and Jantjen Jans.