He is the son of former Pink Floyd bass player and lyricist Roger Waters and his second wife Lady Carolyne Christie, the niece of the 3rd Marquess of Zetland.
Lawrence Dundas, 3rd Marquess of Zetland (1908–1989), lawn tennis player known before 1971 as the Earl of Ronaldshay
In 1970, Scully was married to Lady Carolyne Christie, the niece of the Marquess of Zetland.
3rd Rock from the Sun | Charles Cornwallis, 1st Marquess Cornwallis | South Carolina's 3rd congressional district | Robert Gascoyne-Cecil, 3rd Marquess of Salisbury | Marquess | Michigan's 3rd congressional district | Thomas Fairfax, 3rd Lord Fairfax of Cameron | 3rd United States Congress | Fernando Álvarez de Toledo, 3rd Duke of Alba | 3rd arrondissement of Marseille | Francis Rawdon-Hastings, 1st Marquess of Hastings | Richard Wellesley, 1st Marquess Wellesley | Marquess of Bute | Wills Hill, 1st Marquess of Downshire | James Broun-Ramsay, 1st Marquess of Dalhousie | Henry John Temple, 3rd Viscount Palmerston | David Cecil, 6th Marquess of Exeter | Thomas Radclyffe, 3rd Earl of Sussex | Robert Grosvenor, 1st Marquess of Westminster | Richard of York, 3rd Duke of York | John Stuart, 3rd Earl of Bute | Henry Paget, 1st Marquess of Anglesey | Frederick Hervey, 8th Marquess of Bristol | Frederick Hamilton-Temple-Blackwood, 1st Marquess of Dufferin and Ava | Alabama's 3rd congressional district | 3rd Battalion | William Cavendish-Bentinck, 3rd Duke of Portland | Victor Hervey, 6th Marquess of Bristol | Sir Frederick Pollock, 3rd Baronet | Robert Wynn Carrington, 1st Marquess of Lincolnshire |