Born near Labasheeda, in Slievedooley, County Clare, Ireland, the son of Thomas Gallery and Mary O'Neill.

Once World War 1 broke out Daniel was instrumental in setting up a Home Guard in Montreal.

He was a member of several benevolent societies including the Catholic Order of Foresters and the Knights of Columbanus.

Daniel was extremely proud of his Irish heritage and descent and was a big promoter of Home Rule for Ireland.

His obituary mentions his paternal descent from some prominent Clare families Sheehy, McMahon and Lysaght and his maternal descent from the O'Neills originally Earls of Dungannon and that his maternal Grandfather John O'Neill was a prominent supporter of O'Connell.