Illegitimate son of Lucy Annis of Swerford and registered as Frederick Annis at Birth.
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Frederick is identified in the 1871 census for Oxfordshire and North Berkshire as Frederic KNIBBS, living with his mother Lucy Elizabeth Knibbs.
Frederick is clearly identified as being the illegitimate son of Lucy ANNIS of Swerford, and was baptised at Swerford as Frederick ANNIS some 9 years before Lucy ANNIS married to Benjamin KNIBBS.
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Frederick can also be seen in 1881 but this time, he is calling himself Frederick INNIS, and is seen to be living with his uncle's family at 162 & 163 Herbert Rd., Aston, Birmingham, Warwickshire, England
William INNIS Head M Male 57 Swerford, Oxford, England Grocer (Master)
Elizabeth INNIS Wife M Female 57 Swerford, Oxford, England
Frederic INNIS Nephew U Male 21 Swerford, Oxford, England Tin Plate Worker
Richard WHITMAN Boarder U Male 63 Woodstock, Oxford, England Annuitant
Eliza TOMKINSON Ser U Female 17 B ham, Warwick, England General Servant
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Frederick appears in the 1891 census, married and living at 3, Regent Park Terrace, Aston, Birmingham, Warwickshire, England.
Frederick Innis,Head,M,30,,Tin Plate Worker,Employed,Swinford Oxfordshire,
Rosener Innis,Wife,M,,31,,,Shirley Warwickshire,
Arthur Innis,Son,S,9,,At School,,Birmingham Aston Warwickshire,
Elizabeth Innis,Dau,S,,6,At School,,Birmingham Aston Warwickshire,
Flory Innis,Dau,,,3,,,Birmingham Aston Warwickshire,

His mother Elizabeth was widowed and living in that same area at 136 Herbert Road:
Eliz'th Innis,Head,W,,67,Grocer,Employer,Swerford Oxfordshire,
Richd Whitman,Boardr,S,73,,Living On His Own Means,,Woodstock Oxfordshire,
Mary E Brain,Niece,S,,21,General Serv't Domestic,Employed,Birm'm Warwickshire,
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Couldn't see Frederick in 1901 as either Innis, Annis or Knibbs, so wonder what happened to him.