Pietje Ypes Hoekstra, born circa 1793 (?).

Pietje was married to
Klaas Ates de Jong, born circa 1787, worker.

• 1 : Grietje Klazes de Jong, born in Witmarsum on January 11, 1816, died in Pingjum on June 11, 1855, aged 39 years.
  Grietje was married in Wonseradeel on March 14, 1840, at the age of 24 to Wybren Ynses Wijnalda (aged 25 years), born in Pingjum on September 21, 1814, son of Ynse Wybrens Wijnalda and Tjitske Alberts Dijkstra, died there on May 2, 1865, aged 50 years.
  Wybren was married afterwards in Wonseradeel on April 9, 1857, at the age of 42 to Maike Robijns de Jong (aged 32 years), born in Lollum on November 30, 1824, daughter of Robijn Jans Arbeider (worker and worker) and Saackjen Gialts Kooistra, maid servant. Maike previously had a relation with N.N., born circa 1828 (?). Maike previously had a relation with N.N., born circa 1830 (?).