I am from the Sullivan/McCarthy clan and have just discovered that my Uncle John J. McCarthy was shown in the 1920 Maryland Census as living with a niece, Margaret Elizabeth O'Mailia, wife of James J. O'Mailia, in Sparrows Point, Md. They had a son James J. Jr, and a daughter, Mary A. O'Mailia. The daughter had been born in Connecticut. James O'Mailia Sr. had been born in West Virginia. Margaret Elizabeth was the daughter of John J. McCarthy's sister, Catherine.
Is any of this familiar to anyone on the O'Mailia borad?