Perceval married twice. His first marriage was on 15 February 1737 to Lady Catherine Cecil, who was the second daughter of James Cecil, 5th Earl of Salisbury. Before her death on 16 August 1752, aged 33, they had five sons and two daughters:[10]
Charles George Perceval (1756–1840), eldest son, who succeeded his mother as Baron Arden in the peerage of Ireland, and was created a peer of the United Kingdom, with the title of Baron Arden of Arden in the county of Warwick
Margaret Perceval (b. 17 March 1769, d. 1854),[21] who married Thomas Walpole, sometime ambassador at Munich, a nephew of Horatio Walpole, 1st Earl of Orford, in 1803.[3]
Lord Perceval died on 4 December 1770 at Pall Mall, London, aged 59. Following his death, his widow was created on 23 May 1770 Baroness Arden of Lohort Castle in the county of Cork in the peerage of Ireland, with remainder to her heirs male. She survived her husband and died at Langley, Buckinghamshire, on 11 June 1784, aged 53.[22]
Mount Egmont in New Zealand was named after him by James Cook in recognition of his encouragement of Cook's first voyage. While the mountain has returned to its original Maori name of Taranaki since the 2000s, the Egmont name still applies to the national park that surrounds the peak and geologists still refer to the peak as the Egmont Volcano.[24]
^The Third Register Book of the Parish of St James in the Liberty of Westminster For Births & Baptisms. 1723-1741. 16 February 1737.
^The Third Register Book of the Parish of St James in the Liberty of Westminster For Births & Baptisms. 1723-1741. 1 November 1739.
^The Register of Births & Baptisms in the Parish of St James within the Liberty of Westminster Vol. IV. 1741-1760. 12 March 1741.
^Born in Pall Mall at "one of ye Clock in ye afternoon". Source: The Register of Births & Baptisms in the Parish of St James within the Liberty of Westminster Vol. IV. 1741-1760. 15 May 1744.
^The Register of Births & Baptisms in the Parish of St James within the Liberty of Westminster Vol. IV. 1741-1760. 13 March 1745.
^The Register of Births & Baptisms in the Parish of St James within the Liberty of Westminster Vol. IV. 1741-1760. 18 October 1748.
^The Register of Births & Baptisms in the Parish of St James within the Liberty of Westminster Vol. IV. 1741-1760. 11 March 1749.
^ abThe Register of Births & Baptisms in the Parish of St James within the Liberty of Westminster Vol. IV. 1741-1760. 11 January 1760.
^The Register of Births and Baptisms in the Parish of St James within the Liberty of Westminster. 1761-1786. 19 February 1761.
^The Register of Births and Baptisms in the Parish of St James within the Liberty of Westminster. 1761-1786. 31 December 1767.
^The Register of Births and Baptisms in the Parish of St James within the Liberty of Westminster. 1761-1786. 14 April 1769.