My Wife's grandmother was Ellen (Nellie) Mary McArdle, born Feb. 27, 1860 in Loughgilly Parish, County Armagh. She had a brother Patrick, born Apr. 23, 1858. Her parents were John McArdle and Francis Mallon. Ellen's grandparents were Patrick McArdle and Ellen (Biddy) Quinn. In addition to John, they had two more children, Michael and Sarah.
Ellen Mary McArdle immigrated to the U.S. in the late 1800's and settled in Wilmington, NC and Baltimore, MD. She married Carl Andrew Morck who had immigrated from Bergen, Norway. He worked for the U.S. Revenue Cutter Service (now the U.S. Coast Guard.
I don't know whether any of this information ties in to your research, however, the name Biddy Quinn pops up quite frequently in our records as standing in at family baptisms.