John S. ''Jack'' Coukos, 90, of Watertown, May 21, 2006. Beloved husband of Agnes (Liakos)Coukos. Loving father of William Coukos and his wife Deborah, Peter Coukos, Stephen Coukos and his wife Marie and Andrea Coukos and her partner Valerie Rogers. Brother of George Coukos,Fotini Vellis, Helen Nelson and her husband Theodore DiNati and the late James and Fred Coukos, Olga DiNati and Irene Schladenhauffen. Also survived by 8 grandchildren and many nieces and nephews. Expressions of sympathy in his memory may be made to the Greek Orthodox Church Taxiarchae, 25 Bigelow Ave.,Watertown, MA 02472 or to the Charity of One's Choice.