 In 1863, Ireland was married to Adelia Duane Pell (1838–1915).Adelia was the only daughter of Robert Livingston Pell and Maria Louisa (née Brinckerhoff) Pell.Through her mother, she was a direct descendant of Judge Robert Troup and Peter Goelet, and through her father, she was a direct descendant of James Duane (the Mayor of New York City), Robert Livingston, 3rd Lord of Livingston Manor, and Thomas Pell, 1st Lord of the Pelham Manor (and a Gentleman of the Bedchamber to Charles I).