If this dream relates to real-life experiences with incest, then you need to seek professional advice or counseling. To dream of incestuous practices, signifies erotic desires. It may also be representative of the union between masculine and feminine aspects of yourself. You are in a phase in your life where you are not quite a child and not quite an adult, and thus this dream may be symbolic of the merging of the child and adult within yourself. Alternatively, if you have been arguing with this family member and are expressing your desire to make up, then the dream may be trying to depict forgiveness in an extreme way.