usually when you dream, its has to do with what you did that day of the dream. For instince a lot of dream time is when your sub consious is trying to solve problems for you which is why dreaming is a real plus. Did you argue with your brother at all the day before the dream? or does this particular thing happen in real life. It could possibly be nothing, do you only care about your self and when your brother wants to do something do you say no or have any kind of attitude, its amazing how are sub counsious works. Depending how the dream ended could mean a lot but just look at what happened and its most likely trying to solve something that is going on in your real life