Well, hello there...Mr. Mommy Kevin! You are most certainly welcome to ask any question you would like. After all, parents have to stick together...especially when it involves raising teens and tweens. Right?!
I completely understand brothers and sisters not wanting to share sleeping spaces on vacation. My 16-year-old son and 13-year-old daughter barely even enjoy sitting next to each other in the car...much less having to sleep next to one another.
I would encourage you to
compare the staterooms on the ship you are intending to book. Most of them (which sleep up to four) come with a queen-size bed, a single convertible sofa and an upper berth pull-down bed (which is fixed nightly by the stateroom host/hostess). Therefore, the only argument which you may have to settle is who gets the sofa and who gets the upper berth.
The Concierge 1-Bedroom Suites provide ample space for everyone including a separate bedroom for the adults, a double convertible sofa and a single pull-down bed in the living area, and two separate bathrooms. This is the ultimate in luxury and elbow room for a family!
I hope this helps you plan. Come back if you have more questions or need to settle any more sibling disagreements! Meanwhile, have a wonderful day and a magical vacation. Bon voyage!