Hi Sloe Gin,
He was born in 1875, he only appears as "idiot" in the 1881 census, which is really his 1st census.
As I said I can't find him on 1891 or 1901, and I have just found that he arrived in Australia in 1910, so does make me wonder where he was during those "missing" years.
So he was only 6 in the census, but you would have thought that if he was an "idiot" at 6, then there would have been minimal chances of him going on and getting employment, let alone being able to provide for a family.
Thanks
Nedda