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.
Dream dictionary: Incest dream meanings
Dreaming of incestuous practices, denotes you will fall from honorable places, and will also suffer loss in business.
Progress in some of the arts, new findings.
This dream is very infrequent. It happens to very spoiled people who wish they could be more spoiled. In the dream they show their resentment. It can also be the famous Oedipus complex.