look at the 1881 census free on www.familysearch.org
Ellen was I think a dau of the original John Clues (clewis etc) - her parents in the early census returns state born Eng but she states born NSW where her bro Sydney was - thus you probably have a date for their posting to Australia - William's fa was the soldier - william's son Robert was probably your connection to Port Erin where btw there is still a R Clewis in the phone book