I've got a Catherine Dalton Coughlin, born in Ireland, married to a John Coughlin, also born in Ireland, who have a daughter named Mary Coughlin, who married Patrick Briody. Mary & Patrick were based in Brooklyn, NY. The info I have is Mary was born in Ireland, around 1860, so she could have emigrated as a baby.
Does this match what you have? This could be my Catherine Dalton's father...a BIG help!