Hurlstone was also a successful portrait painter, one of his best heads being that of Richard, seventh earl of Cavan, exhibited at the Society of British Artists in 1833, and again, together with that of General Sir John MacLeod, at the National Portrait Exhibition of 1868.
He is the descendant of Commander the Honourable Oliver Lambart, a younger son of the 7th Earl.
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When he died, the title passed to Roger Cavan Lambart, a descendant of the 7th Earl.
In 1738, he married Lady Gertrude Lambart, daughter of Richard Lambart, 4th Earl of Cavan, and had a son, Francis Thomas-Fitzmaurice, 3rd Earl of Kerry (1740–1818), and a daughter Anna Maria, who married Maurice FitzGerald, 16th Knight of Kerry.