On 30 June 1703 FitzGerald married Elizabeth, second daughter of David Crosbie (died 1717), of
Ardfert Abbey, High Sheriff of
County Kerry, by his wife Jane Hamilton, daughter of William Hamilton of Liscloony,
County Offaly. His wife was a
Protestant and the sister of
Maurice Crosbie, 1st Baron Brandon. Maurice and Elizabeth had three sons of whom: •
John (1706–1741), his immediate successor •
Robert (1717–1781), who succeeded as the 17th knight —and nine daughters, known as the "Nine Geraldines", of whom: • Jane, married George Herbert, Esquire of
Currans • Honora, married Richard Meredyth, Esquire of Dicksgrove (near Currans) • Bridget married first Thomas Sandes and secondly Mr. Creagh • Margaret, married John Hewson of Ennismore == Later life and death ==