Jacobus Coert “Ko” was born in Haarlem 22nd July 1923 and he died on the 5th of March in 2003 in IJmuiden (burried in Velsenbroek). He was a Plummer and married 3rd May 1945 in Zwichau Edith H. Holig (born in Zwichau 6th January 1923). They had two sons, Mathäus Ruud and Roland. Mathäus Ruud was born 8th May 1945 in Zwichau and died 18th August 2001 in Heemstede. He married Janny Lam (born 5th September 1944) in Haarlem 27th July 1965. They had one son (Frank, born in 1965, not married) and one daughter. Roland is married to Carla M. Juffermans. They have two sons, Jeroen (born 22nd February 1971) and Robin (born in 1973). Jeroen married M.J. van der Meer (born 5th January 1966) on the 18th September 2003. Robin (married to S. Schoone; born in 1975) has a son called Kevin, born on the 25th of June 2001.