They married in the Holdy Trinity at Wordsley, West Midlands.

James, his wife Sophia and three children can be seen in 1881 living with his father at Dallington, Northamptonshire, England:
William Knibbs Head Mar 79 Farmer Oxon Deddington
James Knibbs Son Mar 35 Farmer Northants Dallington
Sophia Knibbs Sons Wife Mar 33 Stafford Brierly Hill
William D Knibbs Grandson 4 Scholar Northants Dallington
Charles J Knibbs Grandson 2 Northants Dallington
Margaret Knibbs Grand Daughter 1 Norhtants Dallington
Annie Tomkins Servant 16 Northampton


the 1881 census for England & Wales, living with his wife and three children at his father's farm. See details listed under his father's family page.
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James can be seen in the 1891 census living at North Road, Earls Barton, Northamptonshire, England:
James Knibbs 45 Carrier Northants Dallington
Sophie Knibbs 43 Staffordshire Brierly Hill
William H Knibbs 14 Shoe Clicker Northants Dallington
Charles J Knibbs 12 Carrier Northants Dallington
Margaret Knibbs 11 Scholar Northants Dallington
Mary Knibbs 9 Scholar Northants Dallington
Edward P Knibbs 7 Scholar Northants Dallington
George O Knibbs 6 Scholar Northants Broughton
Annie E Knibbs 2 Northants Earls Barton
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James can be seen in the 1901 census living at North Road, Earls Barton, Northamptonshire, England:
James Knibbs 53 Northampton Dallington Gardener
Sophia Knibbs 52 Stafford Brierly Hill
William H Knibbs 24 Northampton Dallington Soldier
Charles J Knibbs 22 Northampton Dallington Grocers Porter
Margaret Knibbs 21 Northampton Dallington School Teacher
Edward Knibbs 17 Northampton Dallington Shoe Clicker
Edith Knibbs 13 Northampton Northampton 
Annie Knibbs 12 Northampton Earls Barton 
Winifred Knibbs 8 Northampton Earls Barton 
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James can be seen in Kelly's 1906 Directory of Northamptonshire as a Private Gardener, to Mrs Burton of Welton, Daventry
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We can see James and Sophia in 1911 living at Northampton:
James Knibbs Head 66 Married Gardener Domestic Dallington Northants
Sophia Knibbs Wife 64 Married (37 years) At Home Brierlyhill Staffordshire
Margaret Knibbs Daughter 31 Single Card Board Box Making Dallington Northants
Edward Knibbs Son 26 Single Moulders At Cycle Works Dallington Northants
Winifred Knibbs Daughter 18 Single Domestic Service Earls Barton Northants
Herbert Farrow Boarder 20 Single Moulder At Cycle Works Earls Barton Northants

The census shows that Sophia and James had 9 children and 2 died in infancy.
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From the Northampton Mercury, Friday 06 August 1920:

KNIBBS.-—At 23, Park-street, James. the loved husband of Sophia Knibbs, age 73 years.

In 1861, we see Sophia living at Duston. Northamptonshire:
David Oakley Head Mar 38 Tipton Staffordshire
Margarett Oakley Wife Mar 40 Bourley Hill Staffordshire
Sophia Oakley Daur 13 Tipton Staffordshire
Eliza Oakley Daur 11 Tipton Staffordshire
Edward Pitt Oakley Son 6 Tipton Staffordshire
Joseph Oakley Son 2 Poplar Middlesex
David Oakley Son Male 0 Duston Northamptonshire
Daniel Oakley Father Of Head Of Family 77 Garnall Staffordshire
Sarah Ann Penn Niece 24 Bourley Hill Staffordshire
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In 1871, Sophia was living at Duston, Northamptonshire, :
David Oakley Head Mar 48 Staffordshire
Emily Frances Oakley Wife Mar 43 Hale Green Staffordshire
Sophia Oakley Daur UnM 23 Brierly Hill Staffordshire
Eliza Oakley Daur UnM 21 Tipton Staffordshire
Edward Pitt Oakley Son 16 Tipton Staffordshire
David Oakley Son 10 Duston Northamptonshire
Edith Mary Oakley Daur 5 Northampton Northamptonshire
Margaret Oakley Daur 3 Northampton Northamptonshire
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From the Northampton Chronicle and Echo - 14 October 1920:
KNIBBS.—On Oct. 14th , at Park-Street. Sophia, widow of the late James Knibbs. After a short illness.

From the Northampton Mercury, Friday 15 January 1904:
Knibbs. Jan 3rd,, at Salcey L awn, second daughter of James and Sophia Knibbs aged 22.