It is understood from Barbara, William's niece, that William and his family lived in Coventry, West Midlands, England. The rest of the family didn't see a great deal of them.
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William and his family appear at the 1901 census, living in Coventry, Warwickshire, England:
William Knibbs 34 Clifton Oxon Warwick Coventry Corporation Labourer
Ribekah Knibbs 33 Fencott Oxon Warwick Coventry �
Alice Winifred Knibbs 11 London Warwick Coventry �
Mary Eveline Knibbs 8 Clifton Oxon Warwick Coventry �
Herbert Fred Knibbs 6 Clifton Oxon Warwick Coventry �
Henry Robert Knibbs 5 Clifton Oxon Warwick Coventry �
Florence Mabel Knibbs 11M Coventry Warwick Warwick Coventry

Their son Arthur William was seen age 9 years, staying with his uncle James at the 1901 census.

Living with them was Ernest Edward Cottrell, a 22 year old builders labourer from Staffordshire who was boarding with them.

Rebecca can be seen at the 1881 census living at Deddington, Oxfordshire, England with her parents and siblings.
Henry SHIRLEY Head M Male 45 Fencott, Oxford, England Hay Binder (Ag Lab)
Emma SHIRLEY Wife M Female 44 Horton, Buckingham, England Hay Binders Wife
William SHIRLEY Son Male 18 Fencott, Oxford, England Carter (Ag Lab)
Harry SHIRLEY Son Male 14 Fencott, Oxford, England Hay Binders Helper (Ag Lab)
Rebecca SHIRLEY Daur Female 13 Fencott, Oxford, England Scholar
Emma SHIRLEY Other Female 10 Fencott, Oxford, England Scholar
Alice SHIRLEY Other Female 4 Fencott, Oxford, England Scholar

Emma Elizabeth was baptised privately. The PR transcript for Deddington stated that she was "born Jul 27, died". From this, and the fact that there is no reference to her in her aunt Amy Elizabeth's estate documents, confirms that Emma died as a very young infant.