My grandfather Thomas Horgan was born USA on or about 1874 however, his father Peter Horgan was born in Ireland date when or where unknown but my mother told us Cork.
Peter Horgan was married to Mary Kelleher. I hope this helps in establishing a linesge with the Horgans in your family since they emigrated through Boston.Iam not sure if my Great Grandfather or my Grandfather had any Brothers or sisters.
I may know this at a latter date as I continue to do some additional research in
New York City where my Grandfather was on the police force during the 20's before he died through complications at an early age.