Margaret was born on April 9th, 1864 in Ballingarry and her baptism took place on April 9th, 1864. Her godfather was Michael Healy and her godmother was Ellen Casey. Margaret's father was James Casey and her mother was Jane (Janie) Fogarty. Her maternal grandparents are James Fogarty and Eliza Bermingham. She had seven brothers named James, Edward, Ed?, Michael, John, E??? and William. She was the fourth oldest of the eight children.