Jan Johannes van Keimpema, born in Wartena on September 11, 1826, son of Johannes Syttes van Keimpema (worker, fisherman and bargeman) and Gelske Baukes Feenstra, merchant, died in Eernewoude on September 1, 1907, aged 80 years.

Jan was married in Tietjerksteradeel on March 27, 1858, at the age of 31 to his cousin
Ymkjen Piebes de Jong (aged 37 years), born in Akkrum on July 10, 1820, daughter of Piebe Fokkes de Jong (worker) and Akke Syttes Keimpema (woman worker), died in Eernewoude on March 19, 1882, aged 61 years.
Ymkjen was married before in Tietjerksteradeel on February 15, 1844, at the age of 23 to her cousin Syte Johannes van Keimpema (aged 28 years), born in Lemmer on October 5, 1815, son of Johannes Syttes van Keimpema (worker, fisherman and bargeman) and Gelske Baukes Feenstra, barge hand, died in Eernewoude on February 12, 1846, aged 30 years.