 On 2 May 1702 Dunch married Elizabeth Godfrey, one of the maids of honour to the queen, and one of the two daughters and coheiresses of Colonel Charles Godfrey, by Arabella Churchill, sister to the Duke of Marlborough.Her elder sister Charlotte, married Hugh Boscawen, afterwards Lord Falmouth.Dunch joined heartily in the Glorious Revolution of 1688, and seems to have been a Whig throughout life.