@businessg101:
Your sibling got a scholarship and you didn’t. Only those who were part of reviewing your application at Northeastern know why. It is very likely due to one of the five reasons that scottj noted above, which you’ve seemingly rejected.
The two of you presented yourself to NEU in the best way possible. NEU saw something in your sibling and not in you that made them really want him/her to attend. This is your opportunity to learn and grow from this experience.