I seem to have got my Chris and Peter missed up - sorry about that Peter!
The 1841 details showing Mary Kelsall as a widow are the correct family but I don't have much information to work on. Jonathan Kelsall was the son of Mary and Henry but was not living with the family in 1841.
I know Henry was the father of Jonathan, but I don't know the maiden name of his mother Mary or where she was from so I'm clutching at straws here!
I wonder if you would be kind enough to check one more of the clan - John Kelsall who married Charlotte around 1837. Both John and Charlotte were born in Sale and both buried at Timperley, so the parish of marriage is possibly Sale. I'm afraid that I do not know the maiden name of Charlotte.
Many thanks for your help so far. I do appreciate it.
Regards,
Maureen