Hi,
If I've looked at the right family in 1881, then they're still at the same address in 1891,
1891  RG12/4008  f.132  p.12  Middlesborough
11 Ash Street
Robert WHITWORTH  Head  Wid  46  Draper              Lancashire Oldham
Mary                      Daur  Unm  20                         Yorks Audsley Leeds
George J                  Son    S    17  General Labourer  "  "  Middlesborough
Lillian                      Daur          9  Scholar                "  "        "  "
The only birth for a George J WHITWORTH c.1874 Middlesborough I can find is,
George Jefferson WHITWORTH  Mar Q 1874  Stockton  v.10a  p.72
Then there is this marriage, I think 'Millie' could be the pet name of Amelia,
George Jefferson WHITWORTH  Dec Q  1900  Leeds  v.7b  p.740
other names on page,
Amelia ROBINSON
Jane Ethel ROBSHAW
John HOUGHTON
If that is him, then this looks like them in 1901,
1901 RG13/4193  f.40  p.21  Hunslet
3 Leasove? Street
George J WHITWORTH  27  Stalworks Train Rail Driller  Middlesbro Yorkshire
Amelia                      28                                       Farnley    "  "
Regards
Daisy