Charles Beauclerk was the son of Lord William Beauclerk and his wife Charlotte Werden. His father was the second son of Charles Beauclerk, 1st Duke of St Albans, an illegitimate son of Charles II Stuart, King of England, Scotland and Ireland, and his mistress Nell Gywnne.
Charles birth date does not seem to be recorded anywhere but he was probably born about 1727, given that his elder brother William, was born 26 May 1726, and Charles himself was appointed as a page of honour to Prince William, Duke of Cumberland in March 1739/40, and this was usually when boys were in their early teens.
Charles also entered the army, probably at about the same time and served in various regiments and ranks. At some point he was promoted as Captain, and as Major of the 66th Regiment of Foot on 9 May 1758. He was promoted on 16 October 1761 to command of the 107th regiment of foot. and as Lieutentant Colonel of the 3rd Foot Guards.
He may have resigned from the army when he was appointed as Governor of Pendennis Castle, in Cornwall on 16 November 1774, but died 30 August 1775.; 
He married probably in the mid-1750s, Elizabeth Jones, (who died 5 December 1768) and their only surviving child was;
George Beauclerk, born 5 December 1758 at Berwick-upon-Tweed, and was baptised there 2 January 1759. He entered the 3rd Foot Guards 1775, and succeeded his cousin as 4th Duke of St Albans, 1 February 1786.
↑ 4.04.1 Cokayne, George Edward, The Complete Peerage: or a history of the House of Lords and all its members from the earliest times, 2nd ed., vol. 11, p. 290, revised & edited by Geoffrey H. White. London: St Catherine Press, 1949. Digitised edition by ABC Publications, 2003.
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It may be possible to confirm family relationships with Charles by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: