It is a conjecture that Anthony's wife Mary was indeed Mary Veasey. It's a conjecture that the marriage that this is the correct marriage although it seems most likely.

Anthony can be seen at the 1871 census living at Aston, Birmingham, Warwickshire, England with his wife Mary, at the home of his father Richard Knibbs.
Richard Knibbs Head Widr 64 Labourer & Chaff Cutter Oxford Swinford
Anthony Knibbs Son Mar 23 Brass Founder Oxford Swinford
Mary Knibbs Daur in Law Mar 23 Warwick Birmingham
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The 1881 British Census shows Anthony and his family living at 2A Vine Place, Dart St., Aston, Birmingham, Warwickshire:
Anthony KNIBBS Head M Male 32 Swerford, Oxford, England Chandelier Maker
Mary KNIBBS Wife M Female 32 Birmingham, Warwick, England
Albert KNIBBS Son Male 9 Birmingham, Warwick, England Scholar
Fanny KNIBBS Daur Female 6 Birmingham, Warwick, England Scholar
Lizzie KNIBBS Daur Female 3 Birmingham, Warwick, England
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Anthony can be seen at the 1891 census living at Crabbs Cross, Model Cottages Ipsley Warwickshire:
Anthony Knibbs Head Mar 43 Cycle Fitter Swerford Oxfordshire
Mary Knibbs Wife Mar 43 Birmingham Warwickshire
Louisa Knibbs Dau 13 Birmingham Warwickshire
George Knibbs Son 6 Birmingham Warwickshire
Fanny Veasey Mother-in-Law Wid 72 Hixon Staffordshire

I suspect that Louisa in 1891 above is probably the same as Lizzie who was listed in the 1881 census.
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From the Evesham Standard & West Midland Observer - 16 November 1895:
Births, Marriages, Deaths.
DEATHS.
KNIBBS. - November 9,at Crabb's Cross, Ipsley,
Anthony Knibbs, aged 47.

IN 1851, Mary was 3 years old and living with her parents at Fordrough Street, Birmingham, Warwickshire:
John Veasey Head Mar 45 Coal Labourer Warwick Newton
Fanny Veasey Wife 35 Stafford Hixon
Ann Veasey Daur 8 Scholar Stafford Stoke
Solomon Veasey Son 6 Scholar Warwick Birmingham
Mary Veasey Daur 3 Scholar Warwick Birmingham
William Veasey Son 9m Warwock Birmingham
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We see Maryy in 1861, aged 13, living with her mother and siblings at 11 Windmill Street, Birmingham, Warwickshire:
Fanny Veasey Head Mar Staffordshire Stow
Ann Veasey Daur 18 UnM Hair Platter Stoke Staffordshire
Solomon Veasey Son 16 Tube Drawer Warwick Birmingham
Mary Veasey Daur 13 Lapidary Warwickshire Birmingham
John Veasey Son 8 Scholar Warwickshire Birmingham
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The 1901 census shows Mary living at 3 Herbert Road Victoria Terrace, Aston, Birmingham, Warwickshire with daughter Fanny and son George.
Mary Knibbs Head Wid 53 Birmingham 
Fanny Knibbs Daur UnM 26 Cycle Fitter Birmingham
George Knibbs Son UnM 16 Brass Fitter Birmingham
Edward T Birt Boarder UnM 28 Metal Warehouseman
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In 1911, Mary was still living at Aston, Warwickshire:
Mary Knibbs Head Wid 63 Charwoman City Birmingham
Edward Birt Son-in-law 39 Warehouse Labourer Birmingham
Fanny Birt Daur 36 Aston Birmingham
Winifred Birt Granddaur 2 Birmingham
Albert Birt Grandson 0 Birmingham

Agnes died as an infant.
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Our gratitude goes to the members and volunteers at Find A Grave web site for recording the details, in memory of Agnes.

Our gratitude goes to the members and volunteers at Find A Grave web site for recording the details, in memory of Eliza.