Pieter Bonzes Zeilstra, born in Tietjerksteradeel on November 30, 1871, son of Bonzen Jans Zeilstra and Antje Pieters van der Sluis.

Pieter was married in Tietjerksteradeel on June 11, 1898, at the age of 26 to
Johanna Douwes Procee (aged 25 years), born in Tietjerksteradeel on September 21, 1872, daughter of Douwe Johannes Procee and Jifke Gerrits Paulusma.

• 1 : Bonze Zeilstra, born in Surhuisterveen on February 22, 1899.
  Bonze was married in Borger on August 29, 1921, at the age of 22 to (and divorced in Assen on July 11, 1947 from) Everdina Tieks (aged approximately 20 years), born in Wildervank circa 1901, daughter of Roelof Tieks and Everdina Naaijer.
  

• 2 : Jifke Zeilstra, born in Surhuisterveen on July 4, 1900.
  Jifke was married in Borger on March 12, 1921, at the age of 20 to Jakob Spittje (aged approximately 27 years), born in Winschoten circa 1894, son of Jan Spittje and Jantje Engelage.