Update concerning a possible-

Found a Peter McCahey living in Chicago

Birth was 1/5/1883 Death was 28/5/1960 Chicago,Cook,Illinois.

Parents are listed as Owen McCahey and Catherine Megan

He came over to live with a brother named James in 1905...though he also in a Census says 1900 that he arrived.

does this match some of what you found?

By the way- James lived 6106 Washington Ave.Chicago, Cook, Illinois as that was where Peter was headed in 1905. Ship's name was Campania