!841 census index (Brian Lawson)

James Calow age 45 Lonan 4 7 34
Isabella calow age 44 Lonan 4 7 34
Robert Calow age 19 Lonan 4 7 34
John calow age 16 Lonan 4 7 34
Jane Calow age 12 Lonan 4 7 34

1851 census index
James Callow age 58 Lonan 2 9 161
Isabella Callow age 56 Lonan 2 9 161
Jane Callow age 21 Lonan 2 9 161

James Callow died by 1861 census since Isabella is listed as a widow on alms I think (mislaid my notes on the census.. That is why I am using the indexes).
There is a burial of a James callow 25th Oct. 1851 which would fit except the age given is 75.