Traps? The entire Australian ski industry is a trap.. .
Save your money and come to Japan when it reopens. Why? Less crowds, better instructor to student ratio, probably cheaper in he right circumstances, softer snow to fall over on, Japanese food, Japanese whisky...I'm not even asking the piss, it is a significantly better option with offerings over Jan+Feb or Easter to suit the busy school schedules you 3 have.
In Australia my favourite location is Hotham. But if you're all beginners and so on, hit up perisher blew. Easier access than Hotham from Sydney for you, most terrain in Australia on 1 pass, depending how quick the boys pick things up there is some fun piste on offer at the lower end of the blue scale (like roller coaster).
Don't do any f those pissy little beginner fields. Your boys will feel like loosers when their friends who have skied before make fun of them for going to a baby ski field. Plus the very limited terrain will get boring for all within a day or two, even if they aren't very good. Blue cow is on the same pass as perisher, as is guthager. You'll not run out of space very fast there.
You had the ski vs snowboard discussion with them?