There is nothing in the 1851 census. 1861 has:-

Douglas, district 4, entry 308, Collins Court
L (male) Canope, head, married, 40, muscian, Italy
Martha, wife, married, 28, England
Ralfe, son, 10, Italy
Cecilia, daughter, 6, Isle of Man
Ann, daughter,1, Isle of Man

Douglas. district 6, entry 115, 1 Downy Lane
John Green, head, married, 57, whitesmith, Ireland
Ellen, wife, married, 57, Plymouth
Alice Canapae, daughter, married, 26, dressmaker, Peel
George Green, son, unmmrried, 20, blacksmith, Peel
Elizabeth, daughter, unmarried, 18, Douglas
John Canapae, grandson, 9, scholar, Douglas
Joseph, grandson, 8, scholar, Douglas
Ann, grand daughter, 6, scholar, Douglas