In 1861 William age 40 is a fisherman. The address is Portern (Port Erin?) Brada.
In 1871, Ann is 50 and married but shown as head, laborer, living on Port Eron Roade (sic) with Arther (10), James (12) and Robert (8).
By elimination, this would appear to be the same Ann as the one at The Shore in 1881.
In 1871 there is a William Watterson age 51, fisherman, in the District Ghofellan General Lunatic Asylum.
Bruce