It is understood that Henry Edward was the oldest son of John Edward and Fanny Knibbs as he was heir to "the few pounds" in John Edward's estate.
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We can see in 1922, Henry sailed from London, England to East London, South Africa with two female Knibbs', one of whom I assume to be his daughter Marjorie Doreen Knibbs, born in 1901. The other was born in 1884, so I haven't worked out who she was yet. Sadly her initial isn't given, but she is identified as Mrs Knibbs so it may have been a daughter-in-law.

Name: Mr H E KNIBBS
Date of departure: 14 October 1922
Port of departure: Southampton
Passenger destination port: East London, South Africa
Passenger destination: East London, South Africa

Date of Birth: 1861 (calculated from age)
Age: 61
Marital status: Married
Sex: Male
Occupation: Leather Mercht

The following people with the same last name travelled on this voyage: -
Mrs KNIBBS
Miss KNIBBS

Ship: BALMORAL CASTLE
Steamship Line: Union-Castle Mail Steamship Coy Ltd
Where bound: South Africa
Passengers on voyage: 546

KNIBBS H E 1861 M 1922 Southampton South Africa East London
KNIBBS 1884 F 1922 Southampton South Africa East London
KNIBBS 1901 F 1922 Southampton South Africa East London

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Death Notice from the Cape Archives:

MOOC 193200006/9/4193 Ref: 36153
Henry Edward Knibbs

Father: John Edward Knibbs deceased
Mother: Fanny Knibbs (born Collins) deceased
Age at death: 71 yrs 7mnths
Occupation: Retired
Residence: 13 Wynne Street, East London
Surviving Spouse: Emily Newton Knibbs (born Wicks) died six months later (entered in pencil)
Marriage: East London
Date of Death: 24 November 1932
Children: Harry Percival Knibbs
Irene May Martin (born Knibbs) married to William George Arnold Martin
Harold Newton Knibbs
Arthur Reginald Knibbs
Marjorie Doreen Beamish (born Knibbs) married to Gordon Beamish
Norman Owen Knibbs

Notice signed: H.P.Knibbs

File also contains his last will and testament (quite long) and it seems after a quick read that his son H.P. Knibbs was to run the business of J.E. Knibbs and son at 36 Oxford Road, East London.

I have been fortunate enough to have been given information of Emily's background from two different sources.

Firstly, David Bayne of Parklands, South Africa, whose wife is descended from the Wicks family in South Africa gave me the following:

David's wife's great great grandfather was Robert Wicks (1795-1825) who came to South Africa about 1820 (probably what is referred to as an "1820 Settler") he was a ships' pilot working here in the Kowie River (Port Alfred). He was lost at sea somewhere between Port Frances and Port Elizabeth while commanding the Bridekirk in September 1825.
David has no information about Robert Wicks' wife and very little about the one daughter I know of. This daughter married a Jack Reynolds and one of their children, Robert Newton Reynolds was David's wife's grandfather.
David came across a reference to an Elizabeth Wicks who married "a Reynolds" and her parents are given as Robert Wicks and Mary Midilet Newton (which is the same as we have for Emily). Unfortunately no dates at all were given. There was also reference to Elizabeth having 3 sisters, Ellen, Emily and Mabel and a brother George.
It seems highly likely that our Emily Newton Wicks is the sister of Elizabeth "who married a Reynolds" and that Emily is descended from Robert Wicks (1795-1825) above.

Next, I was contacted by Alaine Kent from Victoria, Australia, and she too is researching this part of the Wicks family. She gave me the following information:

Emily was one of seven children born to George Wicks b. abt. 1825, and his wife Mary Ann Midgeley. Emily's siblings were Elizabeth Ann Wicks (who is also mentioned my David Bayne above, and she went on to marry a Sergeant John Michael Reynolds who was b. abt. 1858 in County Clare, Ireland), John Edward, William, Ellen, Sarah Jane and Mabel Blache.
Elaine also tells me that Emily's grandfather was Capt. Robert Wicks from Maidstone in Kent. He was married to Mary Midilet Newton.
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We can see on 2 Oct 1908, Emily and five children sailed from London to the port of East London, South Africa aboard the ship GALEKA of The Union Castle Mail Steamship Company. They travelled 2nd Class:
Mrs E Knibbs 45
Mstr A R Knibbs 16
Mstr H Knibbs 13
Miss M Knibbs 7
Mstr N Knibbs 5
Miss I Knibbs 21
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Emily's Death Notice is on file at MOOC 193300006/9/4264 ref: 37686 at the Cape Archives.

We can see on 2 Oct 1908, Horace, his mother and four of his siblings sailed from London to the port of East London, South Africa aboard the ship GALEKA of The Union Castle Mail Steamship Company. They travelled 2nd Class:
Mrs E Knibbs 45
Mstr A R Knibbs 16
Mstr H Knibbs 13
Miss M Knibbs 7
Mstr N Knibbs 5
Miss I Knibbs 21
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Horace is listed in the book named "Rollcall - The Story of Delville Wood" written by Mr Ian Uys and is included amongst the list of the men who were present in the ranks of the South African brigade at midnight on the 14th/15th July 1916 before its engagement in Delville Wood. Horace survived that particular battle but tragically, was killed in action seven months later at the Battle of Arras, France.

Private Horace Lester KNIBBS - 2nd SAI - Killed in action near Arras (as Lance Corporal) on the 12th April 1917 (Brown's Copse Cemetery)

Horace's brother Arthur was wounded at Delville Wood.
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The Commonweath War Graves Commission has the following reference:

Died at war aged 22 years. There is a memorial at Brown's Copse Cemetery, Roeux, Pas de Calais, France

Horace Lester KNIBBS
Lance Corporal
No: 5642
2nd Regiment, South African Infantry
died on
Thursday, 12th April 1917.
Age22

Theatre of War: France and Flanders
Cemetery: BROWN'S COPSE CEMETERY, ROEUX, Pas de Calais, France
Grave reference: III. B. 32

Additional Information: Son of Henry Edward and Emily Newton Knibbs, of 24, St. James Rd., Belgravia, East London, Cape Province. Served also in German South West Africa and Egypt.
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Cape Archives Death Notice: MOOC 191700006/9/941 Ref: 2427
Horace Lester Knibbs

Notice from Defence Force
Father: Harry Edward Knibbs
Mother: ?
Lance corporal in 2nd SA Infantry SA Defence Force. Killed in action in WWI
Date of death: 12th April 1917

Also a small hand-written will dated 1916 (appears to have been written after he joined up)
Death Notice
Born: East London
Nationality: English
Father: Harry Edward Knibbs of 25 St. Georges Rd, Belgravia, East London.
Mother: Emily Newton Knibbs
Age: 22years 3months
Occupation: Clerk in Wool Office in East London
Unmarried and no children
Place of death: Killed at Fampoux near Arras, France
Signed by: father