Sijtske Kalma, born circa 1861.

Sijtske was married to
Tjerk Vellinga, born circa 1858, merchant.

• 1 : Tetje Vellinga, born in Harlingen on February 22, 1883.
  

• 2 : Jacob Vellinga, born in Harlingen on March 31, 1887.
  

• 3 : Maaike Vellinga, born in Harlingen on April 18, 1889.
  

• 4 : Anna Vellinga, born in Harlingen on June 27, 1890, maid servant.
  Anna was married in Harlingen on August 1, 1912, at the age of 22 to Klaas Boonstra (aged 22 years), born in Harlingen on July 29, 1890, son of Sije Boonstra (bloatercurer, dock hand, docker and transport worker) and Grietje Tigchelaar (maid servant), casual labourer, fisher and workman, died in Groningen on March 29, 1948, aged 57 years.
  

• 5 : Harmen Vellinga, born in Harlingen on September 11, 1891.
  

• 6 : Sytske Vellinga, born in Harlingen on November 18, 1892.
  

• 7 : Trientje Vellinga, born in Harlingen on February 22, 1895.
  

• 8 : Tjerk Vellinga, born in Harlingen on June 2, 1896.
  

• 9 : Jolt Vellinga, born in Harlingen on February 6, 1898.
  

• 10 : Jan Vellinga, born in Harlingen on June 1, 1899.
  

• 11 : Geert Vellinga, born in Harlingen on December 28, 1900.