AirlineNew.
The posts above are very much correct. Unless you are married, CX and the immigration department will treat you as two seperate entities. De facto relationships are not recognised either.
If he is on a Cadetship, then he will get no housing allowance and the starting salary is a little meagre(AUD61K per annum minus 16% tax) - especially if he is supporting one or more extra people and having to pay rent out of that.
The advice above about getting some sort of useable qualification(e.g. teaching English as a second language) is a great idea. Although you may not be able to get a work permit, some people work anyway to earn some money under the table. But, be very carefull.