Son of Pelham Winn and Elizabeth Wighton. Married firstly (1765) to Anne Winn (d. 1774), with whom he had one daughter.1 Married secondly to Jane Blennerhassett in 1783, by whom he had two sons, Charles and George, and two daughters.2 In 1761 he was appointed a Baron of the Court of Exchequer, and in 1776 he was created a Baronet. Shortly before his death, he was created Lord Headley, Baron Allanson and Winn of Aghadoe. Winn was Member of Parliament for the North Yorkshire constituency of Ripon from 1789 until 1797.
- 1Anne Winn was the daughter of Sir Rowland Winn, 4th Baronet, of Nostell Priory.
- 2The younger George married, in 1807, Elizabeth-Mary, daughter of Lewis Majendie of Hedingham Castle. He was elected Member of Parliament for Maldon in 1826 but died the next year. Source: The Gentleman's Magazine, December 1827, notice of the death of George, son of George Winn and Jane Blennerhassett
Boswell met Winn at the chapel of Sir Joseph Yorke in the Hague on April 20, 1764.