We can see Alfred in 1881 living at 38 Mary St., London, Middlesex with three of his brothers and a sister-in-law:
Harry KNIBBS Head M Male 27 St Georges E, Middlesex, England Beer & Wine Seller
Walter KNIBBS Brother U Male 25 St Georges E, Middlesex, England Clerk
Eliza KNIBBS Wife M Female 25 St Georges E, Middlesex, England
Edwin KNIBBS Brother U Male 21 St Georges E, Middlesex, England Brass Finisher
Alfred KNIBBS Brother U Male 19 St Georges E, Middlesex, England Wheelwright
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Alfred can be seen in 1891 living at 29 Hart Street, St Pauls, Strand, London, Middlesex which was the home of his brother Edwin:
Edwin Knibbs head 32 Publican London St George in East
Laura Knibbs Wife 32 London St Pancras
Edward W H Knibbs Son 5 London St Pancras
Lilly Knibbs Dau mnths london St Pancras
Alfred Knibbs Brother 40 Pothouse Manager London St George in East
Elizabeth Knibbs Sister-in-Law 27 Inn Barmaid London Shoreditch
Elizabeth Knibbs Neice 5 London St Pancras
Maude C Knibbs Neice 3 London Haxton
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We see Alfred in 1901, lodging at 6 Anam Street, Whitechapel, London, Middlesex, next door to his brother Sydney:
Alfred Knibbs 40 Boarder St George in the East London

At this time, I'm not quite sure where his wife and children were.
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Alfred died aged 42 years.

Knibbs Alfred of 4 Mountford-street Whitechapel Middlesex died 24 January 1903 at the infirmary Valence-road Whitechapel Administration (with Will) London 7 Febriary to Sydney Knibbs publican Effects £35 10s.