Hi All,
I'm thinking that Robert AITKEN who d Kinglassie, aged 80, in Feb 1851 
might be Robert b 1769 in Kinglassie, son of George.  Unfortunately, the 1841 Kinglassie census was lost en route to Edinburgh ...
Children b Kinglassie with father Robert AITKEN were George 1793, Janet 1795, Margaret 1801, Robert 1807, Isabel 1810, and John 1813.
So Robert AITKEN who m Janet HENDERSON in 1838 in Auchterderran 
might  be the Robert b 1807 in Kinglassie...  Which would make sense for them naming their first son Robert ...
But all these names are such common names that it's impossible to know ...  Grada, you can probably knock out some of these people by a process of elimination but it could be expensive  

It's an interesting puzzle.
JAP