On 19 July 1810, Jenkinson married Julia Evelyn Medley Shuckburgh-Evelyn, daughter of Sir
George Shuckburgh-Evelyn, 6th Baronet, and Julia Annabella Evelyn. The couple had had three daughters: • Lady Catherine Julia Jenkinson (23 July 1811 – 5 December 1877); married Col.
Francis Venables-Vernon-Harcourt, son of the Most Rev.
Edward Venables-Vernon-Harcourt and Lady Anne Leveson-Gower; the couple had no children. • Lady
Selina Charlotte Jenkinson (3 July 1812 – 24 September 1883); married, firstly, on 15 August 1833, William Wentworth-Fitzwilliam, Viscount Milton (1812–1835), with whom she had one child: Hon. Mary Selina Charlotte Fitzwilliam (9 January 1836 – 4 January 1899), who later married
Henry Portman, 2nd Viscount Portman. Lady Selina married, secondly, on 28 August 1845, as his second wife, George Savile Foljambe (4 June 1800 – 18 December 1869), with whom she had four children: •
Cecil George Savile Foljambe (7 November 1846 – 23 March 1907); later the
1st Earl of Liverpool (of the 2nd creation). • Caroline Frederica Foljambe (died 20 October 1895). • Elizabeth Anne Foljambe (died 2 January 1930). • Frances Mary Foljambe (died 25 January 1921). • Lady Louisa Harriet Jenkinson (28 March 1814 – 5 February 1887); married John Cotes, son of John Cotes and Lady Maria Grey, a daughter of
George Grey, 5th Earl of Stamford; they had two sons. Julia died in April 1814, shortly after the birth of their youngest child, Louisa. Jenkinson remained a widower until his death in October 1851, aged 67. In 1828, he inherited the
Jenkinson baronetcy, the barony of Hawkesbury and the earldom of Liverpool at the death of his older half-brother, the former prime minister. On his own death, the barony and the earldom became extinct, but the baronetcy (created in 1661) survived, and was passed on to a cousin. The barony was revived in 1893 in favour of Liverpool's grandson, the Liberal politician
Cecil Foljambe, the son of Liverpool's second daughter Lady Selina and her husband George Foljambe. In 1905, the earldom was also revived in favour of Lord Hawkesbury. ==Arms==