The late Mrs Mackay-Lewis (as Lady Inkin) contested the Vale of Glamorgan as the Conservative candidate in the 2001 General Election.
Her parents, Maj Henry Hutchison TURCAN (2 III 1907 - 20 VI 1977), of Lindores House, Lindores, Cupar, Fife and his wife (married 1939), Lilias CHEYNE (5 XII 1915 - 10 III 1975), also had three sons. Her eldest brother, Henry Watson ("Harry") TURCAN (born 22 VIII 1941) married Jane Fairrie BLAIR (born 11 X 1941), and their son, Henry Arthur John TURCAN (born 31 I 1974), was the husband (married 2004, as his first wife) of Arabella Lucy LOCKHART SMITH (30 III 1971 - 13 VII 2017), of that landed gentry (LG) family.
Mrs Mackay-Lewis' second brother, William James ("Bill") TURCAN (born 4 I 1943), is the husband (marriage registered 1967 - Paisley) of Elisabeth Margaret STEWART (born c.1943), by whom he has three sons and one daughter. His wife is the elder daughter of Andrew Graham STEWART (1901 - 8 V 1964), sometime President of the British Iron and Steel Federation, and his wife (married 5 XII 1929), Barabel GREIG (19 V 1907 - c.1985), of that LG family, of Binsness. Barabel Greig was the second daughter of Robert Coventry GREIG (30 V 1871 - 10 I 1951), who was himself the eldest brother of the Royal courtier, Gp Capt Sir Louis Leisler GREIG, KBE, CVO (17 XI 1880 - 1 III 1953). Her sister, Nancy Margaret GREIG (29 XI 1908 - 3 VIII 2014), was the wife (married 24 IX 1936) of the 2nd Baron Maclay.
Mrs Mackay-Lewis' mother was the sister of Barbara Christian CHEYNE (24 X 1917 - 7 IX 1993), who was the wife (married c.1939) of her father's brother, Patrick Watson TURCAN (17 III 1913 - 20 IX 1996). The Cheyne sisters were the daughters of Maj Harry CHEYNE (8 XII 1882 - 10 VII 1917, killed in action) and his wife (married 3 II 1915, as her first husband), Anne Violet MacMillan SALVESEN (25 X 1889 - c.1969). Maj Harry Cheyne was the son of Sir Henry CHEYNE (2 III 1845 - 27 XI 1915). His wife, Anne Salvesen, was a granddaughter of Salve Christian Fredrik SALVESEN (8 III 1827 - 15 I 1911), the Norwegian-born founder of the Christian Salvesen shipping line.