Timothy J. Horgan was originally from County Kerry, Ireland, from the town of Killorglin. He left out of Co. Cork to come to America. I have been able to locate his baptism record for County Kerry on the Irishgenealogy website.
I have not yet been able to find which relatives were resident of Co. Cork. But they originated in Killorglin. That's where Grampy visited back in the 1980s. We still have family living there.