The Slessor family:
John Arthur Guinness Slessor was s. of John Cotesworth Slessor (1897-1979), G.C.B., D.S.O., M.C., Chief of the Air Staff 1950-2, commandant of the Imperial Defence Coll. 1948-9, Sheriff of Somerset 1965, and D.L. (Somerset) 1969 by his first wife (m. 1923), Hermione Grace (1898-1970), dau. of Gerald Seymour Guinness, of Dorton House, Thame, Oxfordshire, J.P., D.L. (s. of Richard Seymour Guinness, of Dublin) by his wife Eleanor Grace de Capell, dau. of Capt. Arthur Watson de Capell Brooke, of Loddington Hall, Kettering, Northants., J.P., late 4th Hussars, s. of Sir William de Capell Brooke, 3rd Baronet.
John Cotesworth Slessor was s. of Arthur Kerr Slessor (1864-1931), of Holly Grove, Newick, Sussex, Maj., Notts. and Derbys. Regiment (Sherwood Foresters), by his wife (m. 1896), Adelaide Constance (1869-1925), dau. of William Cotesworth (1828-1905), of Clapham, 'landowner' in the census [n.b.- only one William Cotesworth born c. 1828 appears in U.K. death records; his probate record states him to be 'of Chaddleworth House, Wantage, Berkshire']
A. K. Slessor was 2nd s. of John Henry Slessor (1821-1912), of Headbourne Worthy, Hants., M.A. (Univ. Coll. Oxon. [Fellow 1847-62]), rector of Headbourne Worthy, by his wife Charlotte Matilda, dau. of Robert Fennessy [n.b.- an autobiography containing family history written by Priscilla Hayter Napier (grand-daughter of John Henry Slessor) states that Robert Fennessy was the illegitimate son of the 3rd Marquess of Londonderry]. J. H. and Charlotte Slessor's daughter, Alethea (1867-1951) m. Sir William Goodenough Hayter (1869-1924), a judge in the Anglo-Egyptian Service and legal adviser to the Egyptian Government (a Khedivial Councillor from 1912). Their daughter, Priscilla (1908-1998; author of the autobiography mentioned above) married Cdr Trevylyan Michael Napier (1901-1940), D.S.C., R.N., s. of Vice-Adm. Trevylyan Dacres Willes Napier (1867-1920), K.C.B., M.V.O., by his wife Mary Elizabeth, dau. of Adm. Sir Michael Culme-Seymour, 3rd Baronet. The Napiers are treated in BLG 1952, 'of Pennant House'.
Cdr T. M. Napier and Priscilla (née Hayter) had a son, Trevylyan Miles Wentworth (1934-), and two daughters: the elder, Lavinia Elizabeth (1938-), m. 1961, (Francis) Alastair Lavie Robinson (1937-), group vice-chairman, Barclays Bank 1992-6, s. of Stephen Francis Thomas Lavie Robinson (1909-1991), of Newnham, Cambs., solicitor; this family, 'Robinson of Hinxton', appears in BLG 1969. The younger daughter, Anne Catherine Napier (1940-) m. 1968, Archibald Gavin Hamilton, cr. Baron Hamilton of Epsom (l.p.) in 2005, K.B., P.C., M.P. for Epsom and Ewell 1978-2001, Minister of State for the Armed Forces 1988-93. His father was John d'Henin Hamilton, 3rd Baron Hamilton of Dalzell.
John Henry Slessor (1821-1912) was son of another John Henry Slessor, of Tidmouth, Devons., by his wife Charlotte Ann.