Margaret in 1891 @ 16 Charles Street (RG12 4100 83 13)
George Stead, Head, 36, Coal Miner, born Halgarth, Durham
Elizabeth Stead, Wife, 33, born St Giles, Durham
Hannah Briggs Stead, Dau, 14, borh Halgarth
John Stead, Son, 12, born Halgarth
Joseph Briggs Stead, Son, 10, born Halgarth
Margaret Stead, Dau, 8, born Halgarth
Elizabeth Stead, Dau, 4, born Kimblesworth
George Stead, Son, 2, born Kimblesworth
I'd go with Briggs being a possible surname of Margaret's mother to look at - there is a marriage of a George Stead to Elizabeth Briggs registered in Durham in 1875 which would fit with Hannah Briggs Stead's birth about 2 ish years later. reference is 10a/561 if you want to get hold of the certificate
The family are still at 16 Charles St in 1901 as well....Margaret, Elizabeth and George are still at home and there is an addition of a further son called Richard (aged 5, born Kimblesworth) (RG13 4676 120 14)
Margaret seems to be registered in December Quarter of 1882 at Durham (10a 392)