Walter and his brother Sydney Knibbs married the sisters Eliza and Alice Wastell.

We see Walter in 1881, living at 38 Mary St., London, Middlesex, England with his wife and three of his brothers:
Harry KNIBBS Head M Male 27 St Georges E, Middlesex, England Beer & Wine Seller
Walter KNIBBS Brother U Male 25 St Georges E, Middlesex, England Clerk
Eliza KNIBBS Wife M Female 25 St Georges E, Middlesex, England
Edwin KNIBBS Brother U Male 21 St Georges E, Middlesex, England Brass Finisher
Alfred KNIBBS Brother U Male 19 St Georges E, Middlesex, England Wheelwright
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Walter can be seen in the 1891 census living at the Royal Standard, Holborn, St George in the East, London, Middlesex:
Walter Knibbs ---- 36 Beer House Keeper Middlesex
Henry Knibbs Head 37 Inn House Manager Middlesex
Rosena Knibbs Wife 32 Peckham London
Rose Knibbs Dau 4 London ???
Louisa A Overton Neice 15 London Clerkenwell
Edwin Knibbs Nephew 6 London St Pancras

So presumable, Walter was living with his brother Henry and they were at the Royal Standard which was probably an Ale House. It my have been that Henry was the manager, and Walter was the Bar Keeper?

Walter's wife Lizzie was living at the home of Walter's father, Henry Theodore Knibbs in the Prince of Wales Beerhouse, 9 Little Coram Street, St George, London, Middlesex:
Henry Knibbs Head Widr 63 Beerseller Somersetshire
Sydney Knibbs Son M 26 Manager St George's East
Alice Knibbs Wife M 26 Middlesex
Alice Knibbs Dau 2 Bloomsbury, London
Grace Knibbs Dau 8 Bloomsbury, London
Lizzie Knibbs Wife M 56 Middlesex
Walter Knibbs Son 9 Middlesex
Alice M Dau 6 Bloomsbury, London
Eleanor Knibbs Dau 5 Bloomsbury, London
Frank G Knibbs Son 2 Bloomsbury, London
Herbert Knibbs Son 20 Homerton

Lizzie's age has been transcribed incorrectly as she would have been 36 and not 56.
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In 1901:
Walter Knibbs Head 46 Manager Coal Merchants London Stepney Green
Lizzie Knibbs Wife 46 London Bethnal Green
Walter Knibbs Son 19 Collar Cutter Gentlemens London Hoxton
Alice Knibbs Dau 16 London Bloomsbury
Frank Knibbs Son 12 London Bloomsbury
Jessie Knibbs Dau 9 London Bloomsbury
Alfred Knibb Son 7 London Bloomsbury
Thomas C Knibbs Son 3 London Islington
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We see Walter with four of his children in 1911, living at 496 Caledonian Road, Islington, London:
Walter Knibbs Head Widower 56 Foreman Cork Works born London, Commercial Road
Walter Knibbs Son Single 29 Collar Cutter Linen born London, Hoxton Road
Frank George Knibbs Son Single 22 Chauffeur born London, Bloomsbury
Jessie Knibbs Daughter Single 19 No Occupation born London
Alfred Knibbs Son 17 Single No Occupation born London, Bloomsbury

I can't be sure, but there was a Thomas Charles Knibbs, aged 13, living as a boarder at Hillcroft School, Mortimer, Berkshire at the time of the 1911 census, so I wonder if it was Walter's son.

Not 100% sure about the date of death given for Eliza. The age is correct and so too is the location.

I can't be sure, but there was a Thomas Charles Knibbs, aged 13, living as a boarder at Hillcroft School, Mortimer, Berkshire at the time of the 1911 census, so I wonder if it was him.
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Thomas served in the Royal Naval Voluntary Reserve during WWI from 5 Mar 1917. He was recorded as 5'4½", with brown hair, brown eyes and a fair complexion. His character/ability throughout his career were recorded as Very Good/Satisfactory. His postings were as follows:
HMS Victory VI 5 Mar 1917 to 26 Aug 1917
HMS Vivid III 27 Aug 1917 to 30 Sep 1917
HMS Teutonic 1 Oct 1917 to 11 Oct 1917
HMS Vivid III 12 Oct 1917 to 7 Nov 1917
HMS Teutonic 8 Nov 1917 to 4 Feb 1919

The Teutonic was launched on January 19, 1889 and started life as a passenger liner of the White Star Line operating between Southampton and New York. On September 20, 1914 she became an armed merchant cruiser in the 10th Cruiser Squadron. During 1918 whilst Thomas was part of her crew, she served as a troopship on the UK-Egypt service. In 1921 the Teutonic was laid up in Cowes Roads. She was then sold and broken up at Emden, Germany.