Hi KR
I have not found George and his family on the 1891 census but I have found a possible 7 children for them
All baptised Manchester
Thomas bpt 1881
William bpt 1882
Sarah bpt 1883
Elizabeth bpt 1893
Janet bpt 1895
George bpt 1896
Mary bpt 1898
Source Familysearch.org
What strikes me, is that there are no children between 1883-1893, this makes me think they may not have been in England in 1891, was Janet's father from Scotland, could they have gone there, or did the emigrate and returned to England
Margp