...he was born in Cork Ireland on 11th June 1859 to John Horgan and Mary Horgan (nee Leahy). He married Catherine McDermott or (McDermoth) in St. Peter & Pauls Church Cork on 14th June 1879...
What I found slightly off was the birth date given for the 1900 census - May 1858. However, the 1900 couple does have the 1879 marriage date and as it was pointed out earlier, it looks like Catherine's maiden name was McDermot?.
Does this couple follow the Irish naming pattern for your Horgans (with the known children being Edward, John, James, Catherine and Grace Ellen)?
Patrick's occupation in 1900 was shown as Painter. Of course, he could have taken on any work, but did you have any painters in your family?
PS If he truly did immigrate in 1874, perhaps the couple went back to Ireland for the marriage and shortly thereafter returned to America?
