The son of Sir Edward Seymour, 5th Baronet, of Berry Pomeroy, a descendant of Lord Protector Somerset by his first marriage, to Catherine Fillol, Edward Seymour was baptised at Easton Royal, Wiltshire, on 17 January 1694.

[1] On 8 March 1716 or 5 March 1717, at Monkton Farleigh, Edward Seymour married Mary Webb (born at Seend on 22 October 1697, died 1 February 1768, and buried at Seend), a daughter of Daniel Webb, of Monkton Farleigh, and wife Elizabeth Somner, daughter of John Somner, of Seend.

His first cousin was Francis Seymour, 1st Marquess of Hertford, son of his uncle Francis Seymour-Conway, 1st Baron Conway In December 1740, his father died and Seymour inherited his manors in Wiltshire and Devon.

On 23 November 1750, the Duke died, and Seymour duly succeeded to his titles.

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