He was knighted in Edinburgh by Edward Seymour, 1st Earl of Hertford, for his part in the capture of that city in 1544. He also took part in the Siege of Boulogne in September 1544. Under John Dudley, Viscount Lisle , he saw action against the French at the Battle of Spithead in 1545 and was sent as one of the peace commissioners to France the following year.
George Seymour, Viscount Beauchamp (11 September 1725 – 11 September 1744), predeceased his father, unmarried. Elizabeth Percy, suo jure 2nd Baroness Percy (26 November 1716 – 5 December 1776), married Sir Hugh Smithson, 4th Baronet, later 2nd Earl of Northumberland by right of his wife and 1st Duke of Northumberland by creation; had issue.