Roelof van Kammen, born in Harlingen on March 8, 1858, son of Sybrand Arends van Kammen (baker) and Trijntje Posthuma.

Roelof was married to
Trijntje van der Meer, born circa 1869 (?).

• 1 : Janke van Kammen, born in Harlingen on December 24, 1892.
  

• 2 : Sybrandina van Kammen, born in Harlingen on November 28, 1893.
  

• 3 : Trijntje van Kammen, born in Harlingen on April 19, 1895.
  

• 4 : Sybrand van Kammen, born in Harlingen on June 14, 1896.
  

• 5 : Rinke van Kammen, born in Harlingen on July 18, 1897, sailor merchant navy, barge hand, bargeman, jobless, guard anti-sabotage services and shore-hand, died in Leeuwarden on April 30, 1977, aged 79 years.
  Rinke was married in Harlingen on December 31, 1925, at the age of 28 to Aafke Tigchelaar (aged 24 years), born in Midlum on March 31, 1901, daughter of Simme Gerrits Tigchelaar (worker, tileworker and workman) and Janke Wielinga (woman worker), died in Leeuwarden on September 2, 1984, buried there on September 6, 1984, aged 83 years.
  

• 6 : Menno Jan van Kammen, born in Harlingen on February 25, 1899.
  

• 7 : Klaasje van Kammen, born in Harlingen on April 27, 1901.
  

• 8 : Sietse van Kammen, born in Harlingen on June 8, 1902.