He was s of Col Lionel George Cotterill NEAME 1897-1980 scion of that gentry family of Kent and his 1st w (her 2nd of 3 h) Daisy CStJ (Viscountess Dudley) 1894-1985 d of Charles Francis HANCOX c1862- by his 26 Nov 1887 m (St Stephen, Wandsworth) to Lucy Maria UDALL 1865-1944. He m 1965 reg Q3 Berks Susan Carol d of T W SHAW of Manor Farm House, Wokingham, Berks, and had three sons:
1. Richard Harry S. b 1966 reg Q2 Berks: m c1998 Lulu H d of Howard Edwin PANTON 1933-2016 of Hanbury, Worcs by his c1960 m reg Q1 London to Rhona S FORBES b c1937 [?and had issue]
[?Two children]
2. Christopher Francis G. b 1968 reg Q2 Berks: m 2002 reg Q2 Suffolk Lucy Claire d of Anthony BAILEY of Aldburgh, Suffolk and had issue
2.1 Alexander Timothy Frederick b 2005 reg Q4 Wandsworth
2.2 Harry Louis George b 2008 reg Q4 Colchester
2.1 Phoebe Gillianna Scarlett b 2 Sep 2003 (Times 9 Sep) reg Q3 Ken&Chelsea
3. Henry William Matthew b March 1974 reg Q2 Berks: m 17 March 2007 Flora Robinson b 1976 only d of Rupert Nicholas HAMBRO CBE 1943-2021 scion of that gentry family of The Hyde and Mary Robinson (Robin) 1934-2022 d of Francis BOYER of Philadelphia, and had issue
3.1 Archie Jasper William b 15 Oct 2008 reg Q4 Westminster
3.2 Oliver Jake Samuel b 17 June 2011 reg Q3 Westminster