Yes, the Corkills were confusing because there were so many of them, and in Maughold Corkill often married Corkill who were sometimes cousins and sometimes unrelated.

1841 census Maughold, 2 22 114 Cottages nr Cornaa Mill:
Thomas CORKILL 55 Linen & Woollen weaver Isle of Man
Eleanor CORKILL 60 Isle of Man
John CORKILL 20 Lead ore miner Isle of Man

In this family Thomas's eldest brother inherited the farm, and younger sons were weavers or miners. I didn't see an occupation for Peter, but Peter Senr's wife (another Corkill!) came from the same land-owning family as Thomas.
See Manx Notebook on bar at the top of the screen for info. about mining.

Sue