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As far as one can tell, your grandmother did not have any brothers..........are you seriously suggesting that all of her nephews and nieces (of whom you have given details on here) were illegitimate? And, presumably, all having the same mother..............

Deaths Dec 1911 (>99%)
Tait Isabella 17 Newcastle T. 10b 149

1901 records a Margaret aged 8...........not with family in 1911

There is, however, a Jane aged 18 in 1911, who isn't on 1901

I'm not rubbishing your ideas..........just trying to rationalise the situation......

Do you have your grandmother's birth cert?

This MAY be Margaret in 1911............

1911 census

Person: TAIT, Margaret Address: Upsall Thirsk

Yrs married Sex Age Birth Year Occupation Where born Image
TURTON, Edmund Rissbrough Head Married M 53 1858 Jp Ds Yorkshire Thirsk VIEW
TURTON, K Sarahlementina Wife Married22 years F 51 1860 London St James VIEW
TURTON, Edmund Spencer Son Single M 21 1890 Officer In The Tramway London Chelsea VIEW
WYNTER, Hermine Francis Visitor Single F 26 1885 VIEW
TUPLING, Rebecca Servant Single F 29 1882 Cook Housekeeper Domestic Kingston Yorks VIEW
ATKINSON, Edith Servant Single F 28 1883 Lady's Maid Domestic Yorkshire Hutton Crawick VIEW
BRUMFIELD, Edith Servant Single F 30 1881 Housemaid Domestic Lincolnshire Hougham VIEW
MCGUNAGLE, Mary Servant Married F 32 1879 Laundry Maid Domestic Lincolnshire Barrow in F VIEW
BOYES, Ellen Servant Single F 22 1889 Housemaid Domestic Yorkshire Osmotherley VIEW
AMOS, Nellie Servant Single F 24 1887 Kitchenmaid Domestic Yorkshire York VIEW
HOLMES, Maude Servant Single F 24 1887 Laundry Maid Domestic Lancashire Barrow in Furness VIEW
HAWKSBY, Mary Servant Single F 17 1894 Housemaid Domestic VIEW
TAIT, Margaret Servant Single F 18 1893 Scullery Maid Domestic Northumberland N;castle VIEW
SHERWOOD, Frederick Servant Single M 24 1887 Footman Domestic Yorkshire Hovingham VIEW
RG number: RG14
Piece: 29052
Reference: RG14PN29052 RG78PN1678 RD530 SD2 ED13 SN15
Registration District: Thirsk
Sub District: Thirsk
Enumeration District: 13
Parish: Upsall

The parents of the family on the censuses.........

Marriages Sep 1890 (>99%)
BOOTHROYD Margaret Elizabeth Newcastle T. 10b 91
GARDNER Agnes Newcastle On Tyne 10b 91
Tait James Newcastle T. 10b 91
WATSON William Newcastle T 10b 91

Births Jun 1892 (>99%)
Tait Jane Annie Newcastle T. 10b 97

You could try contacting some of the people on here;

http://www.wikitree.com/genealogy/TAIT