From his obituary, we can summize the following:
Mr. & Mrs. Elmer Decker of Belmont had at least nine sons and three daughters. The following were the ones living in 1950:
Walter Decker of Burlington, NJ
Stewart Decker of New Florence, PA
Elmer Decker of Philadelphia, PA
Raymond Decker of Cleveland, OH
Paul Decker of Johnstown, PA
Joseph Decker of Belmont, NY
Harry Decker of Pittsburgh, PA
Oscar Decker of Friendship, NY?
Belle Decker Janakis of Pittsburgh, PA
Marie Decker of Canton, OH
Beulah Decker Kaiser of Belmont, NY
Blanch Decker Travis of Alfred, NY
Charles Decker of Belmont, NY (Charles married Dora Hoffman and had a daughter named Hazel Decker of Hornell. Charles died in Hornell, New York, on 4 Feb 1950 from wounds suffered after explosion. He is buried in Belmont Cemetery).