En , Henry Augustus Dillon-Lee épouse Henrietta Browne, sœur de Dominick Browne (1er baron Oranmore et Browne), fille de Dominick-Geoffrey Browne, et de Margaret, fille de George Browne, 4e fils du 1er comte d'Altamont.
Gerald-Normanby Dillon (1823-1880), m. à Lady Louisa-Isabella-Georgiana FitzGibbon, fille du comte de Clare.
Il meurt le . Sa veuve meurt trente ans plus tard à l'hôtel Windsor, à Paris, le , à l'âge de 73 ans.
Publications
Short View of the Catholic Question (London: J. Debrett, 1801), 32 pages
Letter to the Noblemen and Gentlemen who Composed the Deputation from the Catholics of Ireland on the Subject of their Mission (London: J. Budd, Crown and Mitre, 1805), online at Google Books, 56 pages
A Commentary on the Military Establishments and Defence of the British Empire (Dillon publisher: Printed by Cox, Son, and Baylis ... for E. Kerby, 1811)
The Tactics of Ælian: Comprising Military Systems of the Grecians (London: E. Kerby, 1814), online at Google Books
Discourse upon the Theory of Legitimate Government (Florence, 1817), online at Google Books, 89 pages
The Life and Opinions of Sir Richard Maltravers: an English Gentleman of the Seventeenth Century, Volume 1 (London: G. and W.B. Whittaker, 1822), online at Google Books Corvey CME 3-628-48097-3; ECB 345; EN2 1822: 29; NSTC 2D13576; OCLC 35663915.
The life and opinions of Sir Richard Maltravers: an English gentleman of the seventeenth century, Volume 2 (London: G. and W.B. Whittaker, 1822), online at Google Books
Rosaline de Vere, Volume 1 (London: Treuttel and Würtz, Treuttel junior and Richter, 1824), online at Internet Archive Corvey CME 3-628-48547-9; ECB 502; EN2 1824: 29; NSTC 2D13577; OCLC 12423730.
Rosaline de Vere, Volume 2 (London: Treuttel and Würtz, Treuttel junior and Richter, 1824), online at Internet Archive
↑Ciarán McDonnell, « A 'Fair Chance'? The Catholic Irish Brigade in the British Service, 1793–1798 », War in History, vol. 23, no 2, , p. 150-168 (lire en ligne, consulté le ).