In 1851, William was living at Northend, Burton Dassett, Southam, Warwickshire with his 1st wife Elizabeth and two of their children:
William Knibb Head Mar 49 Cattle Dealer Warwick Kingscote
Elizabeth Knibb Mar 25 Warwick Avon Bassett
William Knibb Son 9 months Warwick Radway
Elizabeth Richards Mother-in-law Wid 60 Warwick Birmingham
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We see this William Knibb in 1861 living at Hook Norton, Oxfordshire with his 2nd wife Ann:
William Knibb Head Mar 59 Inkeeper Warwickshire Knightcote
Ann Knibb Wife Mar 49 Inkeepers Wife Warwickshire Avon Bassett
Jemima Chater Dau Un 20 Warwickshire Fenny Compton
Sarah Chater Dau Un 18 Warwickshire Fenny Compton
Mary Ann Chater Dau 12 Warwickshire Fenny Compton
William Knibb Son 10 Warwickshire Radway
Hannah Archer Grandaughter 3 Northamptonshire Upper Boding

The girls were obviously his second wife Ann's daughters from her first marriage, and William aged 10, the son from William's first marriage.

Hannah Archer was the daughter of Ann's daughter, Jane Chater, who married a man named Thomas Archer in Solihull, Warwickshire during q2/1851.

The marriage register shows Ann's name as CHATER but we know this was her name from her first marriage to Thomas Chater.
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In 1851, Ann can be seen as a widow, running the "The Fox" beer house in Knightcote Lane, Fenny Compton:
Ann Chater Head Wid 39 Berr House Keeper Warwickshire Avon Dassett
Thomas Chater Son U 20 Blacksmith/Journeyman Warwickshire Fenny Compton
Jane Chater Daur U 18 Servant Warwickshire Fenny Compton
Edward Chater Son 16 Ag Lab Warwickshire Fenny Compton
George Chater Son 13 Ag Lab Warwickshire Fenny Compton
Jemima Chater Daur 10 Scholar Warwickshire Fenny Compton
Sarah Chater Daur 8 Scholar Warwickshire Fenny Compton
Daniel Chater Son 5 Scholar Warwickshire Fenny Compton
Mary Ann Daur 3 Warwickshire Fenny Compton
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In 1871, we see Ann again living at Market Place, Butchers Row, Banbury, Oxfordshire
Ann Knibb Head M 60 Licenced Victualler (employs one other) Warwickshire Avon Dassett
Mary A Chater Daughter UnM 22 Daughter of Licenced Victualler Warwickshire Fenny Compton
Jane Gunn Servant UnM 18 General Servant Warwickshire Redway
George Nash Ostler UnM 20 Ostler at an Inn Oxfordshire Banbury
Patrick McCormack Traveller UnM 48 Line Draper Ireland
Thomas Spelt Traveller M 27 Musician Lancashire Manchester
Mary Ann Spelt Traveller's Wife M 20 Musicians Wife Lancashire Manchester
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From Jackson's Oxford Journal, 25 September, 1875:
Petty Sessions report: Interim license granted to Ann Knibbs, The Exhibition Inn.
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In 1881, we see Ann, now widowed for a 2nd time, living at Horse Fair (Exhibition Inn), Deddington, Oxfordshire, England
Ann Knibb Head Widow 67 Avon Dassett, Warwickshire, Inn Keeper
Jemima Salter Daur Widow 40 Fenny Compton, Warwickshire, Mothers Help
Mary A Salter Gr-Daur 14 Twyford, Oxfordshire
Elizabeth Salter Gr-Daur 10 Banbury, Oxfordshire
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From Jackson's Oxford Journal, 26 May, 1883:
General Friendly Club annual meeting and dinner at the Exhibition Inn “where a good, substantial, hot spread was furnished by Mrs. Knibb.”
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Ann died in 1885 aged 73.
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After Ann died, the pub, then called the Volunteer Inn, was transferred to Ann's daughter Jemima, from her first marriage.