What QF status do you have? The higher your status the better the chance
Getting 4 upgrades on SYD-LAX is pretty hopeful but if you are all in a single booking, iirc, either you will all get upgraded or none of you will.
Would kids actually mind being on their own if you were only able to get 2 ? It isn't that uncommon for cabin splitting to occur.
You can use your miles to upgrade all and it is your status and not the status of the passenger which witll determine priority
Dave


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