Banns read at Deddington identifying Robert from Clifton and Elizabeth of Steeple Aston. They married in Q4 1866.

Robert worked as a labourer for some time at St. James Farm, Clifton, Oxfordshire, England. The farm was owned by a Thomas Wright and interestingly, Robert's younger sister Sarah married Thomas Wright's son who was also Thomas. The farm eventually passed into the hands of Thomas Wright (jr.) and his wife Sarah.

It's understood from Robert's niece Barbara that he worked at Wrights' Dairy Farm at Clifton which I suspect is the same place.
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Robert was a very devout Chapel man who read a passage out of the Bible every night. He would not do such a thing as clean his boots on a Sunday, attending every service at the little village chapel.
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Robert can be seen at the 1861 census living at Leys Farm, Upper Heyford, Oxfordshire, England.
Urban Malings Head 33 Farmer Oxon Somerton
Charlotte Ann Malings Sister 30 Sister Oxon Somerton
Robert Knibbs Servant 25 Carter Oxon Clifton
Emma Baugher Servant 21 House Servant Oxon Calcott
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The 1871 census for Oxfordshire and North Berkshire shows Robert as living at Clifton, Oxfordshire with his wife and their first three children:
Robert Knibbs abt 1839 Clifton Oxfordshire Head Deddington Oxfordshire
Elizabeth Knibbs abt 1847 Middle Aston Oxfordshire Wife Deddington Oxfordshire
William Knibbs abt 1867 Clifton Oxfordshire Son Deddington Oxfordshire
James Knibbs abt 1869 Clifton Oxfordshire Son Deddington Oxfordshire
Harry Knibbs abt 1870 Clifton Oxfordshire Son Deddington Oxfordshire
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From Jackson's Oxford Journal (Oxford, England), Saturday, August 4, 1877;
Robert Knibbs of Clifton and George William Heritage, John Baker and
Samuel Gibbs, were charged by Josiah Kirby, the Vaccination Officer of the Woodstock Union, with having neglected to have their respective children - Levi Knibbs, Lily Ellen Heritage,
Bertha Baker and Walter Gibbs - vaccinated. defendants gave the usual reasons for not complying with the law, namely, that they considered their
children in good health at present, and they doubted in vaccination tended to promote good health. An order was made in each
case to have the children vaccinated within one calendar month. Mr. Bush from the office of R.B.B. Hawkins , Esq., represented the Guardians.

Again, from Jackson's Oxford Journal (Oxford, England), Saturday, January 14, 1888;
At Bampton West Division Petty Sessions, Burford January 6.
Herbert Harwood was fined 12s., John Baker 10s., and Robert Knibbs 11w., for non-compliance with the Vaccinations Act.
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The 1881 census shows Robert and his family living at Deddington:
Robert KNIBBS Head M Male 40 Clifton, Oxford, England Farm Laborer
Elizabeth KNIBBS Wife M Female 33 Middle Aston, Oxford, England Farm Laborers Wife
William KNIBBS Son Male 14 Clifton, Oxford, England Farm Laborer
James KNIBBS Son Male 12 Clifton, Oxford, England Farm Laborer
Harry KNIBBS Son Male 10 Clifton, Oxford, England Scholar
Fred KNIBBS Son Male 8 Clifton, Oxford, England Scholar
George KNIBBS Son Male 4 Clifton, Oxford, England Scholar
Walter KNIBBS Son Male 2 Clifton, Oxford, England
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The 1891 census for Oxfordshire and North Berkshire shows Robert still living at Clifton, Oxfordshire with his wife and now, six children:
Robert KNIBBS 48
Elizabeth 38
James 21
George 14
Walter 12
Sarah E. 10
Amy E. 4
Ernest T. 2
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The 1901 UK census shows Elizabeth and two of the children still living at Clifton, Oxfordshire. Robert died in 1895:
Elizabeth Knibbs 52 Oxford Middle Aston Oxfordshire Deddington �
Walter Knibbs 22 Oxford Clifton Oxfordshire Deddington General Labourer
Ernest Knibbs 12 Oxford Clifton Oxfordshire Deddington �
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This is the house at 1 Victoria Row, Clifton (click to enlarge) where Robert lived with his wife and children. The house remained in the family for several generations. Robert's great-grandson Colin Rapley was also born there. Robert's son Walter, moved to 3 Victoria Row in 1948 after his wife died. the middle house was occupied by a Mr & Mrs Bowerman.
Colin Rapley has told me that the cottage was very old fashioned even in the 1940's. They still collected water from the village well, used oil lamps and of course had an outside toilet. A pig was kept at the bottom of the garden and when killed and salted was hung in the kitchen.

The Chapel at the far end of the row of cottages is St James Chapel, consecrated on 10th June 1853. The land on which it is built was believed to have been given by Mr Wright of St James Farm, Clifton, when it was built in 1851. As mentioned above, Robert Knibbs was employed as a labourer by Mr Wright at St James Farm, and Robert's younger sister Sarah eventually married Thomas Wright junior who inherited the farm from his father.

See the pages from Elizabeth's mother's Bible

Quite probably, she had an older brother Charles b.1844 at Steeple Aston, married to Hannah with 6 children, all living at The Village, Steeple Aston, Oxfordshire in 1901, next door to her parents William and Hannah. Charles was an Agricultural Labourer.
The children were John (13), William (11), Henry (9), Rose (7), Tom (5) and Alice (2).
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There was also a possible younger brother Alfred b.1849 at Steeple Aston married to Mary with 3 children Emma (6), Walter (3) and Francis (1), all living at 39 Gt Tufton St, London, Middlesex, England. Alfred was a Tailor.
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Elizabeth appears in the 1901 census living at Clifton with her sons Walter and Ernest:
Elizabeth KNIBBS, Wid, 52, Oxford Middle Aston
Walter KNIBBS, son, 22, General Labourer, Oxford Clifton
Ernest KNIBBS, son, 12, Oxford Clifton

Fred can be seen in the 1891 census living at 22/23 Old Cavendish Street, Cavendish Square, St Marylebone, London with several others amongst which there were two lads also from Clifton in Oxfordshire. It appears to have been a restaurant. There were 8 staff working there. Fred and five others were all waiters, then there was a senior steward and 5 female domestic servant.

Fred Knibbs S 18 Waiter Oxon Clifton
John Drinkwater S 19 Waiter Oxon Clifton
John Stockley S 21 Waiter Oxon Clifton
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One of the brothers died at University Hospital, London. As the other brothers are accounted for, it must have been Fred who we have as dying aged 20 years in Sep qtr. 1893. No-one knows or remembers why he would have been there.