Original: In 1749 Grenville married Elizabeth Wyndham (before 1731-5 December 1769), daughter of Sir William Wyndham, by whom he had seven children: Charlotte Grenville (c. 1754-29 September 1830), who married Sir Watkin Williams-Wynn, 4th Bt.
Simplified: In 1749 Grenville married Elizabeth Wyndham (before 1731-5 December 1769), daughter of Sir William Wyndham.