Hi Glyn
As far as i'm aware (and oops, i have been wrong at times

) If you're entitled to an Oz passport, your boys should also be able to get one once your's is through.
As for your wife, you can apply for a spouse visa and once granted, she has to enter oz within a period of one year (from date of medicals i think), which then automatically validates the visa, extending it to 5 years. ie. she then has 5yrs in which to enter oz permanently.
Hope this helps.