Another possiility is the following family living at 26 Shaws Brow, Douglas:
William Callow head 40 born Douglas, town overseer
Ann Callow wife 38 born Douglas
William Callow other 7 born Douglas scholar
Ann Callow other 5 born Douglas
John Callow son 5 born Douglas school boy

William Callow as a town overseer may have worn a uniform with a pill box hat that vaguely resembles a sea captain's.