All the symbols and images that are given to you by God in a dream have great meaning and the interpretation of will reveal God’s heart, message and mind to you. God will use people in dreams to communicate a specific message to you, either by them speaking it to you in the dream, or the just having the person in the dream themselves could be a message to you.
Whenever you are interpreting a dream, it is very important to mark done who is in the dream, what they are doing, and what they said in the dream. In a dream, God will use men and women of your past to those you presently know and even people you don’t know, and from the living to those who have died. This doesn’t mean, however, that the dead person is actually talking to you in their real form (unless it is a trip to Heaven or Hell through an “out of body” experience from the Lord).