Willem Pruis, born on February 11, 1828, died on November 27, 1899, aged 71 years.

Willem was married in Leeuwarden on January 24, 1861, at the age of 32 to
Harmke Douwes Visser (aged 20 years), born on September 16, 1840, died in Leeuwarden on March 5, 1900, aged 59 years.

• 1 : Marijke Pruis, born on May 30, 1862, died in Harlingen on October 1, 1928, aged 66 years.
  Marijke was married on July 3, 1886, at the age of 24 to Haring Ages de Bock (aged 24 years), born on January 11, 1862, son of Age Harings de Bock (ship's carpenter's hand and shipwright) and Grietje Ynzes de Boer, carpenter, died in the year 1933, buried in Harlingen, aged 71 years.