He was s of 3rd Viscount MERSEY 1906-70 (and presumptive heir to that viscountcy, although not to the Scots Lordship of Nairne) and The Lady NAIRNE 1912-95 (d of 6th Marquess of LANSDOWNE 1872-1936). He m 1965 Anthea Rosemary b 1941 d of Leopold Richard SEYMOUR 1912-2000 (3xgt gs of 1st Marquess of HERTFORD 1718-94, as well gt gs of 7th Duke of GRAFTON 1821-1918 (who was 5xgt gs of King CHARLES II), etc etc) and Sheila Isabel Adeliade 1920-99 only d of Col Arnold Charles Paul BUTLER CBE 1890-1973 (gs of John BULTEEL 1827-97 sometime head of that gentry family of Leighon) and Violet Frances Gertrude 1893-1972 d of Col Abel Henry SMITH 1862-1930 (descendant of Abel SMITH the Notts banker and related to many of whom we treat including The KING) and Hon Isabella Anna BROWNLOW 1864-1935 d of 2nd Baron LURGAN 1831-1882 by his w a dau of 3rd Baron KILMAINE 1794-1873, and had three sons and a dau. His eldest son CHARLES RICHARD PETTY Bigham b 21 April 1967 (m with three sons and a dau) is now the presumptive heir to the 5th Viscount MERSEY b 1966.