no, there is no special waiting area for concierge passengers...
however you do get to board before the other passengers...
which means you do NOT have to get in the long line that will form for boarding...
instead, as soon as you check in head for the area next to the little caefeteria right in front of the big window with the ship right outside..
it's right next to the door that you go through for boarding...
the handicapped will go on first then the concierge passengers...
the concierge people form their own little line just when boarding begins...
there is a small sitting area right in front of the big window facing the ship..
that's where the concierge passengers wait for boarding..
if you chithcat with everyone there you'll probably discover they're all cat 3,also..
since the cat 4 in your group are your teenagers they'll just go on board with you (since they could have been in your room...the cat 3 holds 4 passengers....in a cramped sort of way)....maybe you should confirm this, or maybe you should just assume this to be true...after all they can't expect your kids to board separately from you...