Hope this isn't too long winded
Thanks to the recently published BMD indexes I've traced my line back to Robert Cain and Christian Fargher who married in Patrick in 1825.
I think I've picked them up in 1841 and subsequent census (see below). I'm puzzled by his change of occupation from farmer, over a 20 year plus span to that of Lead mine labourer. Have I mis identified this family ? Would the economic realities of life in the IOM be responsible for such a drastic change ? Any advice or suggestions would be greatly appreciated.

1841 census
HO107/14664/10 page 4
Robert Caine - age 40 - Farmer
Christian Caine - age 35
Charlotte Caine - age 15
William (?) - age 14
Robert - age 13
Thos (?) - age 9
John - age 8
Catherine - age 6
Ellin - 11 months

1851 census
HO 107/2523
Residence - Ballanass (?), Patrick
Robert Caine - head - age 54 - Farmer of 20 acres employing 3 labourers
Christian Caine - wife - age 50
Ellin Caine - daughter age 10
Elizabeth Caine - daughter age 9
All born Patrick

1861
RG9/4427 page 16
Residence - Glenvershun (?) Patrick
Robert Cain - Head of the family - age 64 - Labourer in the lead mine - born Patrick
Christian Cain [nee Fargher] - age - 59 - Labourers wife - born Patrick
John Cain - son - 27 Labourer in lead mine - born Patrick
Elizabeth Cain - daughter - unmarried daughter - age 18 - born Patrick
Robert Kneen - grandson - age 2 - born Patrick
William Shimmin - boarder - 19 - Labourer in lead mine [subsequently married Elizabeth above] - born Patrick

1871
RG10/5571 page 68
Castletown Road, Old Foxdale, Patrick
Robert Caine -73 - Head - Labourer at mines
Christian Cain - 68 Labourers wife
Robert Kneen - 12 grandson - Lead ore washer