William and his wife Emily in later years. Click to enlarge.

We think this is William Thomas Knibbs. We know his name is William and it is either William Thomas, or his father (click to enlarge). I suspect the photo is from the early 1920's in which case it would be William Thomas - but I could be wrong.
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The 1881 British Census shows William aged 18, living at Grimshaw Hall, Knowle, Warwickshire, England with a large contingent of a family called MAYON from Yardley in Worcestershire and Sheldon in Warwickshire:
Mary MAYON Head W Female 47 Yardley, Worcester, England Farmer
John MAYON Son U Male 27 Yardley, Worcester, England Farmer
Thomas MAYON Son U Male 23 Yardley, Worcester, England Farmer
James MAYON Son U Male 22 Yardley, Worcester, England Druggist & Dry Salter
William MAYON Son U Male 21 Yardley, Worcester, England Farmer
Mary MAYON Daur U Female 17 Yardley, Worcester, England
Ann MAYON Daur U Female 16 Sheldon, Warwick, England
Ada MAYON Daur U Female 14 Sheldon, Warwick, England Scholar
Ellen MAYON Daur Female 12 Sheldon, Warwick, England Scholar
Bertha MAYON Daur Female 10 Sheldon, Warwick, England Scholar
Sydney MAYON Son Male 8 Sheldon, Warwick, England Scholar
Herbert MAYON Son Male 3 Sheldon, Warwick, England Scholar
William NIBBS Servant U Male 18 Sheldon, Warwick, England Waggoner
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William and his family appear in the 1891 census for Warwickshire, England, living in the Civil Parish of Aston:
"Arthur St, 9 Court 7 House",1,
William T Knibbs,Head,M,28,,Railway Drayman,Employed,Sheldon Warwickshire,
,,,Emily E Knibbs,Wife,M,,29,,,Kingsbury Warwickshire,
,,,Walter T Knibbs,Son,,4,,,,Aston Warwickshire,
,,,Florence Knibbs,Dau,,,2,,,Aston Warwickshire,
,,,William Knibbs,Son,,1,,,,Aston Warwickshire,
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William's family unit appears in the 1901 census living at 15 Whitby Place, Aston, Birmingham, England. Edward Albert is the one listed as Albert, aged 8
Wm Tho Knibbs 38 Warc Sheldon Railway Carman
Emily E Knibbs 40 Warc Whitacre  
Walter Tho Knibbs 14 Birmingham Brass Polisher
Florance E Knibbs 12 Birmingham  
Wm Fredk Knibbs 11 Birmingham
Henry Knibbs 9 Birmingham  
Albt Edwd Knibbs 8 Birmingham  
Ellen Knibbs 4 Birmingham  
Emily E Knibbs 3 Birmingham
Arthur Knibbs 1 Birmingham
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Next, we see William and his family at the 1911census, living at 1 Church Grove Aston, Birmingham:
William Thomas Knibbs Head Married 48 Carter Warwickshire Sheldon
Emily Elizabeth Knibbs Wife Married (24 years) 50 Warwickshire Lether Whitasse
Walter Thomas Knibbs Son Single 24 Brass Polisher Warwickshire Birmingham
William Frederick Knibbs Son Single 21 Packer Warwickshire Birmingham
Henry Knibbs Son Single 19 Brass Polisher Warwickshire Birmingham
Edward Albert Knibbs Son Single 18 Tube Bender Warwickshire Birmingham
Ellen Knibbs Daughter 14 Shop Assistant Warwickshire Birmingham
Arthur Knibbs Son 11 School Warwickshire Birmingham

I am told by Hilda Elliot, Walter's 1st cousin once removed, that Walter had just one eye, and wore a patch over his missing eye.

Hilda spoke to Edward Knibbs (Walter's nephew, b. 1918 at Aston, Birmingham)and he too remembered his uncle Walter had just one eye with a patch over the other.

Walter was a bachelor.

Walter appears in the 1901 census aged 14, living at Aston, Birmingham, Warwickshire, England with his parents.

In Memory of

Rifleman WILLIAM FREDERICK KNIBBS

B/2787, 8th Bn., Rifle Brigade
who died age 26
on Wednesday 13 September 1916.
Rifleman KNIBBS, Son of William Thomas and Emily Elizabeth Knibbs, of 179, St. Andrew's Rd., Small Heath, Birmingham.

Remembered with honour
THIEPVAL MEMORIAL

Howard died as an infant, aged 1 year.

Emily died aged 5 years 5 months.