How does a full ride affect sibling aid?

Ok let me restate this so that I understand. I also have a few questions.

Your sister attends CMU (I assume Carnegie Mellon) and you may attend UMD on a full b/k scholarship.

Your sibling qualifies for FA but CMU did not give her any…is that correct? You go on to state that she has not received her FA yet.

Which one is it? Did she not receive it yet…or…are they not giving her any? I am confused.

What does the NPC for CMU say for two in college…when one sibling has a full ride? Does it ask about the cost for a sibling?

If you have a full ride, why would your family be full pay for two?

If your sister is full pay at $75,000+ per year, and your college is essentially free…how is that any different than your parents paying $40,000 per child if you choose another school?

If you and your sister are being asked to pay $40,000 each based on the NPC at meets full need schools…that means that with one in school you will definitely be a full pay family.

I am still confused, unfortunately.