Hello Dave.
To Quote you.
I think this is Georges family
1891
GRAHAM, William G Head Married M 35 1856 Shoe Black Westminster, London
GRAHAM, Priscilla Wife Married F 32 1859 Westminster, London
GRAHAM, William Son Single M 7 1884 Westminster, London
GRAHAM, George Son Single M 6 1885 Westminster, London
GRAHAM, Caroline Daughter Single F 4 1887 Westminster, London
GRAHAM, Hannah Daughter Single F 2 1889 Westminster, London
GRAHAM, Henry Son Single M 0 (8M) 1891 Westminster, London
Piece: 80 Folio: 57 Page: 18
Registration District: St George Hanover Square
Address: 18, Ship Court, Westminster London
I tried to find the address, but it's not shown in any form, on any old street maps,
The info you found does fit with what I already knew, unless there is a better fit with another family. I've updater George on Ancestry.co.uk with what I have currently.