from A Dictionary of Music and Musicians (A.D. 1450-1880)
fourth son

Musical Scotland, Past and Present:Being a dictionary of Scottis Musicians
Another son [of Henry George Nixon], Henry Cotter (Mus. Bac.) [Cantabury 1876] , born London 1842, is settled at Brighton, and has shown much ability as composer and teacher.

another source composed the symphonic poem “Palemon and Arcite”

He was the organist at Hull, Woolwich, Black Heath, Spanish Place and St. Leonard’s, various denominations.

In the 1851 census civil parish of Lambeth, ecclesiastical parish of St Mary, Surrey, Lambeth registration district sub district Lambeth first church living at No. 8 Union Place.
Caroline Nixon, Head of family, widow, age 43 [the date although clear must be a mistake as John Danby could not be her father and this doesn’t match the 1841 census], born at St Giles Middlesex, school mistress.
Daughter Caroline M. Nixon age 23, born Lambeth Surrey, Professor of Music.
Daughter Henrietta G? Nixon age 21, born Holloway Middlesex, Teacher of Dancing.
Son Valentine Nixon age 14, born Holloway, Middlesex, Clerk ?? Office.
Daughter Sophia S? Nixon age 12 born Glasgow.
Son Henry C. Nixon age 8 Hemingdon? London.
Servant Ellen Pursell age 13? born Ireland.

In the 1871 census 3 Hinde St., St Marylebone.
Head Caroline Lamb, widow, age 50, Professor of Music, born Lambeth.
Brother Harry Nixon, unmarried, age 28, professor of music, born Kensington.
Son Edward Lamb, age 13, scholar, born Marylebone.
Daughter Caroline Lamb, age 12, born Marylebone.
Daughter Marion Lamb, age 11, scholar, born Marylebone.
1 servant.

In the October to December 1873 marriage index Henry Cotter Nixon and Alice Mary Woodward, Hastings district Sussex, volume 2b, page 49.

Cambridge University Alumni - Trinity College
born 1842, died December 25, 1908
Admitted at Trinity, December 4, 1875. (4th son of Henry George, organist of Southwark Cathedral and Caroline Melissa, daughter of John Danby, glee composer) born 1842 in London. Mus.Bac 1876. Had taught music and the organ by Deval of Hull, by Henry Smart, Dr. Steggall and G.A. Macfarren. Organist of St. Peter’s, Woolwich, 1864-8; of St. James’, Spanish Palace, 1870; of St. Mary Magdalene, St. Leonard-on-Sea, 1872-7. His compositions include A Sonata for piano and violin; A Pianoforte Trio (1st prize, Trinity College, London, 1880); Sonata for pianoforte and violincello; Symphonic Poem, Palamon and Arcite; Overture, Titania; Concertstuck for piano and orchestra; madrigals, part songs, etc. Died December 25, 1908. (Degrees in Music; Grove, Dict. of Music, III. 383.)

In the 1881 census civil parish of Hastings St. Leonards, Sussex, Hastings registration district, Sub district St Mary in the Castle, 6 Shornden Villa.
Henry C. Nixon, head, married, age 36, Professor of Music, born London, Middlesex.
Wife Alice M. Mixon age 34, born Abbots Ann, Hants.
Son Henry D. Nixon age 1, born St. Leonards, Sussex.
2 servants

In the 1891 census same districts and address as above except Silver Hill Town.
Henry C. Nixon, married, age 46, Professor of Music, born London.
Wife Alice M. Nixon age 44, born Hampshire.
Son Henry D. Nixon age 10, born St Leonards on Sea.
Daughter Alice V. S, Nixon age 8 born St Leonards on Sea.
Son Malvine? C. H. Nixon age 5, Born St Leonards on Sea.

In the 1901 census civil parish of Deptford St Paul, ecclesiatical parish of St Catherine Hatcham, registration district Greenwich, sub district Deptford South.
Henry C Nixon, widower age 58 born London, Professor of Music, living on his own account.
Daughter Alice V. Nixon, single age 18, born St Leonards on Sea.
Son Conrad M. H. Nixon, age 16 born St Leonards on Sea.
One servant.

In the Oct to Dec 1907 death index, Henry Cotter Nixon, age 65, Bromley, Greater London, Kent vol 2a page 285

National Probate register Nixon Henry Cotter of Bramletye Alexandra-crescent Kinnaird Park Bromley Kent died 25 December 1907 Administration London 10 February 1908 to Conrad Malcom Heath Nixon [his son] commerical clerk. Effects 149 pounds 7 shillings 3 pence.

Additional note:

An Anthony Nixon was in possession of a letter written by John Danby. Anthony’s grandfather, was the musician Henry Cotter Nixon who was grandson of Danby and son of another musician Henry George Nixon.

Obituary
MR. HENRY COTTER NIXON. "The death is recorded with regret of Mr. Henry Cotter Nixon, which took place Bromley. "The fourth son of Henry George Nixon —well known in his day composer—he was born May 17th. 1842. and was a grandson, on his mother's hide, of John Danby the glee composer. Mr. Nixon held various organetships, especially at Roman Catholic Churches, the last being .St. Patrick’s, Soho-square. In 1876 obtained the degree of Bachelor Music at Cambridge, and long ago 1867 he obtained the Fellowship the Royal College of Organists. During residence Hastings did much promote the ????? music at that watering?-place, as conductor the Hastings and St. Leonards Orchestral Society, and in other directions. His competitions include tour concert overtures and other orchorastal works, CoucerUstuck?? for pianoforte, chamber and pianoforte music, cantatas. chureu? music, etc." The above running from the February uumbcr? the Musical Time.-" will bring back old memories to many local musicians, as during the time Mr. H. C. Nixon was living at St. Leonards he took active part the musical life the town. He was for a short time organist of St. Mary Magdalen Church, but he preferred to consider himself more of pianist than an organist. During the time associated with the old Hastings and St. Orchestral Society, first playing member (viola), and afterwards succeeding Mr. Herman Muscat conductor, he played several concertos for pianoforte and orchestra, and his pianoforte playing was of very high order. Enthusiastically devoted his art. his whole being was permeated with it. and it may safely said that lived for music ami nothing but music. took a keen delight in Chamber music, and many were the delightful musical evenings spent his house in Shornden-villas, and when could got an octett of strings together his delight was unbounded—his eight kings he used call them. composer belonging THE ROMANTIC SCHOOL was well known, and his string and pianoforte trios were great beauty. a glee writer, too, was very successful, and won several prizes in open competition. October, 1888, "Magnum Opus," symphonic netting ot' "Palatnon and Arcite," was brought out what was meant to be a benefit concert; but the benefit was all the wrong side, and although strong committee did their best to cut down expenses. Mr. Nixon insisted having such large contingent of professional performers that he was out of pocket when all expenses were Unfortunately, after leaving St. Leonards, Mr. Nixon fell evil days; losing first his eldest child, a boy of great promise, and then his wife; after some time his own health gave way. Later on became connected with school of music in suburbs, but for some years now had quite any of sight. His friends will always have pleasant thoughts his early work here, and the gave to music, more especially to Chamber music in this town. 

In the Jul to Sep 1895 death index, Alice Mary Nixon, age 50, St Olave Southwark, London, Surrey vol 1d page 122.

National Probate Calendar
Nixon Alice Mary of 284 New-cross-road Surrey (wife of Cotter Nixon) died 17 September 1895 at Guy’s hospital Surrey Probate London 1 June 1896 to John James Watts solicitor Effects 60 pounds 5 shillings 3 pence