I wonder if this might be William the fisherman father?

1871 Douglas
William 36 boatman, Emma 36, Kate 15, William 12, Joseph 8, Stanley 5, Mary J. 2--all Malew

1881 Douglas
District Number HH Number Last Name First Name Place Relation Condition Age Occupation Born Census for
4 151 CAIN William 7, Post Office Ln H 47 Boatman at sea Douglas Douglas
4 151 CAIN Margaret """" W 48 Braddan Douglas
4 151 CAIN Manley """" S 15 Scholar Douglas Douglas
4 151 CAIN James """" S 10 """" """" Douglas
4 151 CAIN Martha """" D 8 """" """" Douglas

These are William Caine and Emma Kelly md 3 Nov 1855 Braddan. I don't know much else about them at this point.

DJD