Interestingly, Banns were read at Swerford in July 1870 for a marriage between Humphrey Knibbs and Hannah Hancox. There is no known marriage for Humphrey and Hannah, so the suspicion is that for one reason or another, it didn't take place.
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The 1881 census shows Humphrey living at Swerford, Oxfordshire, England
Humphry KNIBBS Head M Male 36 Swerford Labourer (Ag)
Eliza KNIBBS Wife M Female 27 Swerford, Oxford, England
Sarah ROSE Daur U Female 7 Swerford, Oxford, England Scholar
Albert KNIBBS Son U Male 4 Scholar
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The 1891 census for Oxfordshire and North Berkshire shows Humphrey living at Swerford, Oxfordshire with his wife and younger son:
Humphry KNIBBS 46 Agricultural Labourer
Eliza 36
Albert 14 Agricultural Labourer

Living with them is William Rose, father-in-law, aged 75 years, a widower and identified as employed as an Agricultural Labourer.
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Humphrey is seen as aged 58 years, and living at West End, Swerford with his wife Eliza (47) at the 1901 census.
Humphry KNIBBS, 58, Stonemasons Labourer, Oxon Swerford
Eliza KNIBBS, 47, Oxon Swerford
William ROSE, Widr, 86, Labourer, Oxon Swerford
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In 1911, he can be seen living at Great Tew, Enstone with his wife and grandson:
Humphrey Knibbs Head Married 66 Roadman Labourer Swerford Enstone Oxon
Elizabeth Knibbs Wife Married (5 years) 55 Great Tew Enstone Oxon
George Knibbs Grandson 14 Farm Labourer Swerford Oxon