Willem Nielsen, born in Harlingen on April 7, 1836, son of Rintje Johannes Nielsen (dock hand and chimney sweeper) and Geertje Gerrits Driesen, dock hand, died in Harlingen on December 17, 1924, aged 88 years.

Willem was married in Harlingen on August 8, 1861, at the age of 25 to
Doutje Kwast (aged 24 years), born in Bolsward on April 10, 1837, died in Harlingen on December 28, 1877, aged 40 years.

• 1 : Siebe Nielsen, born in Harlingen on July 17, 1862, died there on October 6, 1876, aged 14 years.
  

• 2 : Rintje Nielsen, born in Harlingen on March 18, 1864.
  

• 3 : Anna Nielsen, born in Harlingen on December 22, 1865.
  

• 4 : Geert Nielsen, born in Harlingen on November 6, 1868, workman, died in Franeker on November 30, 1913, aged 45 years.
  Geert was married in Harlingen on December 17, 1891, at the age of 23 to Catharina Mulder (aged 20 years), born in Harlingen on September 30, 1871, died there on February 5, 1932, aged 60 years.
  

• 5 : Ynse Nielsen, born in Harlingen on March 23, 1873.