The Lennox sisters were the daughters of Charles Lennox, 2nd Duke of Richmond in the Peerage of England and 2nd Duke of Lennox in the Peerage of Scotland, and Lady Sarah Cadogan (1705–1751), daughter of William Cadogan, 1st Earl Cadogan.
The earliest recorded mention of the Newland brothers is in a letter dated Thursday 9 July 1741 from the Duchess of Richmond to her husband.
Sarah Lennox, Duchess of Richmond and Lennox (1706–1751), daughter of William Cadogan, Lady of the Bedchamber to Queen Caroline
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Charles Lennox, 2nd Duke of Richmond (1701 - 1750) married Lady Sarah Cadogan (1706 - 1751), daughter of William Cadogan, 1st Earl Cadogan, on 4 December 1719 at The Hague, Netherlands.
Lady Sarah Cadogan, daughter of the first Earl of the first creation, married Charles Lennox, 2nd Duke of Richmond, and was the mother of the famous Lennox sisters (and also the grandmother of Charles James Fox).
Lady Sarah Lennox (1745 – 1826), daughter of Charles Lennox, 2nd Duke of Richmond, love of George III