The Earldom of Clanricarde was inherited by the sixth Marquess in 1916 according to a special remainder in the letters patent.

[3] In 1806, he was made Baron Monteagle in the Peerage of the United Kingdom,[4] which gave the Marquesses an automatic seat in the House of Lords.

[3] Lord Sligo's younger son, the fourth Marquess, represented County Mayo in Parliament from 1857 to 1868.

[7] Lord Sligo did not inherit Westport House and the Altamont estate in Ireland, as his predecessor, the 11th Marquess, had successfully petitioned to have an Act of the Oireachtas (an Irish Act of Parliament) passed which enabled him to break the family trust and leave the estate to his five daughters.

[8] In 1984, the current Lord Sligo married firstly Christina Maria Suaznabar, daughter of Luis Suaznabar; they were divorced in 1992, after having two children:[7][9] On 22 January 2016, at Wollongong, New South Wales, he married secondly Claire Suzanne van Middelkoop.

[9] There are further male heirs in line to the earldom of Altamont and its subsidiary titles, who are descended from the younger son of the 2nd earl.