Not sure if this is a brother or any relation.
Attached are death notices and an obituary for Leon DEC, born 1901 in Poland, died 4 Dec 1964 in Windsor Ontario (which is just across the river from Detroit). He came to Windsor 36 years ago and owned a shoe store.
Mentioned in the obit are a brother John in Windsor, siblings Anthony, Anida and Bronis in Poland, his wife Mary and a daughter Janina in Poland.
A search at the Windsor Library obituary index (not complete; date is the day the obit was published in the Windsor Star, not date of death)
DEC, John Feb 14, 1966
DEC, Katarzyna Nov 22, 1989
DEC, Leon (spouse Mary) Jan 5, 1964 (this date appears to be incorrect)
DEC, Roman Sep 19, 1990 http://www.windsorpubliclibrary.com/obits/results.php?lname=...
Is this a very common surname from Poland? It just seems too short and simple to me.