Petrus Jozef Sietse de Jong was born on April 3, 1915 in Apeldoorn in the Netherlands, and died at age 100.
He was born in a Roman Catholic family that originated from Friesland as the sixth child of seven children of Joännes Jans de Jong (24 February 1878 – 28 November 1931), a railroad superintendent, and Gijsberta Adriana Schouten (29 December 1877 – 30 June 1957).
After leaving secondary school, de Koninklijke Hogereburgerschool (now de Koninklijke Scholengemeenschap), Piet joined the Royal Netherlands Navy as a midshipman in 1931 and subsequently attended the Royal Netherlands Naval College in Den Helder.
In 1934 Piet received his commission as a Sub-lieutenant.
After World War II Piet married former resistance fighter Anna Geertruida Jacoba Henriëtte “Anneke” Bartels (born 8 January 1915).
At the time when they met Bartels was serving in the women’s division of the Royal Netherlands Navy.
They married on June 26, 1947 and had one daughter and two sons, Maria (born May 31, 1948) Jos was born on August 31, 1949) and Gijs (born 15 October 1952).
Anneke Bartels died on January 6, 2010 two days before her ninety-fifth birthday after suffering from heart and lung illnesses since 2000.
Piet de Jong passed away at age 100 in 2015.