I agree with the others. These types of tents are good for the cool/neat factor; they are not particularly great tents. I don't know of any serious camper that uses one.

If you are trying to teach self reliance, actually having a tent they have to learn how to setup is a great way of doing that. I would look for a 3-person dome tent.

I would avoid tents with poles that cross multiple times or at weird locations. My REI Taj 3 tent isn't difficult to setup, but I have never seen anyone do it right on there first try. I have a Kelty and an old Eureka that are much easier. They are more classic dome style tents and there is no reason a 9 and an 11 y.o. couldn't learn how to set it up.