Thanks so much for the info, Grace.
I went to Stephen's obituary that Grace supplied and typed all of the information re surviving siblings at that time (1979). In 1979 he has 5 surviving brothers and two surviving sisters, as follows:
Stephen D. Kukoda, survived by five brothers:
Anthony Jr., Detroit
Anthony KUKODA 18 April 05 31 March 85 Male Detroit, Wayne, Michigan
Paul, Buffalo, NY
Paul Kukoda 11 Mar 1909 Feb 1993 Buffalo, Erie, New York
Joseph, Charlotte, FL.
Joseph Kukoda 15 Mar 1991 Charlotte 79 White 10 May 1911
Frank, Milford, NJ
Frank Kukoda 14 Mar 1914 7 Nov 1988 Milford, Hunterdon, New Jersey
Michael, Calif. (apparently moved to TX)
Michael Kukoda 7 Sep 1915 25 Mar 1995 Harlingen, Cameron, Texas
Two sisters:
Madlyn Chasar, Kintnersville (moved to Hellerton?)
Madlyn ChasarHellertown Pennsylvania 610-838-5349 2001 2002
Anna Briggs, Annandale-on-Hudson, NY
(I didn't find an Anna Briggs that I was sure was our Anna Briggs, but I found an Anna Kukoda which seems to match, as follows):
Anna Kukoda 12 Jun 1911 29 Aug 1993 Bethlehem, Northampton, Pennsylvania
The only sibling still showing alive according to my records (which were only current thru 2002) is Madlyn Chasar. I only did a quick search for Madlyn (but didn't find her under that spelling in any of the early 1900 census) so it's possible someone else can come up with something more recent.