Jan Jans de Jong, born circa 1789 (?).

Jan was married to
Geertje Hendriks van der Veen, born circa 1793 (?).

• 1 : Sijke Jans de Jong, born in Kollumerland on November 10, 1816, died in Dantumadeel on June 29, 1898, aged 81 years.
  Sijke was married in Tietjerksteradeel on May 10, 1845, at the age of 28 to Egbert Lubbers van Wieren (aged 24 years), born in Tietjerksteradeel on March 23, 1821, son of Lubbertus Gerbens van Wieren and Baukje Egberts Westra (maid servant), died in Dantumadeel on November 10, 1899, aged 78 years.