To dream of incestuous practices signifies erotic desires. It may also be representative of the union between feminine and masculine aspects of yourself. You are at 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. Or perhaps you are in a relationship with someone who reminds you of your own father, mother or other family member.
- Common Dreams