martin HEHIR
Martin Hehir was the brother of Thomas Cunningham's mother, Margaret Hehir. According to his Wikipedia page, he was born in Ireland in 1855 and eventually became a priest and for many years was President of Duquesne University.
When Thomas Cunningham and his brothers emigrated from Ireland, they first came to Pittsburgh because of their uncle.
I found a posting on an Ancestry.com message board that says Martin's parents were a John Hehir and a Mary Clancy born in the 1820's and they had 8 kids, including Martin and Margaret.