Hi Val
I am assisting Mike with your search and have been searching the censuses, etc. Not sure if you have access to them? Anyway, here are my findings.
1861 Census of England
Living at Lower Street, Stoole
George Stagg Head 49 Ag Lab born Stoke, Somerset c1811-1812
Susan Wife 36
William son 24
Eliza daur 21
Alfred 18
Edwin 10
Henry 7
Albert 5
Walter 2
1851 Census
George Stagg 37 head Shepherd born Stoke c1813-1814
Susan 26 wife Glover
Joseph 16 Milking Boy
William 11 Shepherd
Eliza 9 Glover
Alfred 7
Edwin 5 months
Sarah W
Caroline Wakley sister-in-law 24 Glover
Caroline Wakley niece 2
1841 Census
At Stoke under Hamdon
Geo Stagg 25 Ag Lab
Elizabeth 25 Wife
Joseph 5
Mary 3
William 2
I checked the 1871 but could find neither George nor Susan. I think the death you found for George is correct.
I also found these. There is no age on the first one. The second one if correct would mean she was born c1814.
Deaths Sep 1861
Stagg Susan Yeovil 5c 309
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Deaths Dec 1869
Stagg Susan 55 Yeovil 5c 340
Hope the above is of some help.
Marian