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
__________

In 1901, Alfred is seen to be lodging at 7 Anam Street, Whitechapel, London, Middlesex in the house of his brother Sydney. I suspect Sydney was working a the time of the census:
Alfred Knibbs 40 Boarder St George in the East London
Alice Knibbs 36 Wife (husband absent) Bethnal Green London
Alice Knibbs 12 Dau Scholar Bloomsbury London
Grace Knibbs 10 Dau Bloomsbury London
Ada Knibbs 8 Dau Bloomsbury London
Sydney E 7 Son Bloomsbury London
Florence Knibbs 2 Dau Plastow London
Victoria G Knibbs 2mnths Dau Whitechapel London

At this time, I'm not quite sure where his wife and children were.