The incest in dreams could be interpreted as the symbol of hidden sexual desires. The dream could also point to the feminine and masculine aspects of your personality. Perhaps you are the teenager at this time of your life and becoming and adult, therefore you find it hard to get separated from your parents. If the dream about the incest is the reflection of your waking life, then you should look for professional help, because it will help you to deal with this situation.
Read more about dreaming of Incest in other dream meanings interpretations.