Bearing in mind the names you've quoted for your grandmother's siblings, how about this family from the 1901 census:
RG13; Piece: 4797; Folio: 30; Page: 52
Willington Terrace, Willington
Robert Gilchrist, 34, Copper Smith at Engine Works, b. Newcastle on Tyne
wife Isabella, 32, b. Newcastle on Tyne
Matilda, 12, b. NoT
Edwin, 11, b. NoT
Elizabeth, 9, b. Willington
Isaac, 8, b. Willington
Robert, 4, b. Willington
Henry, 3, b. Willington
Anthony, 10m, b. Willington
Visitor Mary A Crofton, widow, 66, b. NoT
And, bearing in mind the visitor's name, how about this marriage?
Robert Gilchrist/Isabella Crofton - Apr-Jun 1888 NoT
That should get you going!
Dazey