In my dream, someone came to my house, not sure who they were or why they came. This person said that they were going to kill my younger brother. My entire family was there. No one in my family did anything though. We all just cried and waited for this person to kill my little brother. This person just stayed in my house with us. I woke up before anything actually happened but it was probably the scariest dream I ever had.
If you had this dream soon after you came to college, it could mean something about your relationship with your brother/your family. Maybe you were really close with your brother, to the point of feeling like you took care of him and protected him (even if you didn't realize it consciously). Anyway, having the dream that someone came to kill your brother could mean that you're afraid something is going to happen to him or that he is going to need help and you're not going to be there to help him or take care of him, and that though your family will be there, they won't be able to do anything.