If your brother appears in your dream, he may simply represent your brother in real life. However, when you have a dream about your brother, he often represents something about yourself.
Your brother in your dream can represent qualities in yourself that you think that you and he both share. By allowing you to see these qualities in another person, your dreaming mind is helping you to understand them better and to accept them in yourself.
If your brother has qualities that you do not like, and these qualities play an important role in your dream, you may be concerned that you are developing these qualities yourself.
An older brother in a dream – regardless of whether you have an older brother in real life – can represent wisdom gained from experience, while a younger brother can represent innocence and naivety. A younger brother can also symbolize the ability to see things in new ways.