Hi there,
No access to 1851 but 1841 says the following.
living in the town, wisbech rd, wimblington are
George fisher 60 cattle dealer y
Mary fisher 55 y
George fisher 25 cattle dealer y
John fisher 20 Ag Lab y
Sarah fisher 20 y
John fisher 10 y
Mary fisher 35 y
Johns age is slightly off, but if you allow for rounding down , then john fisher 10 seems to be correct.
Hope this helps
JuliePen