If so, have you talked about it to a good friend or psychotherapist? If not, why not do so? Where there is symbolism, it will probably be as follows:
(1) For a man, a dream of incest with your daughter will usually express fear of the erotic element in your feelings towards your daughter in real life; but could be a straightforward expression of desire.
(2) For a man, in a dream of incest with your sister, the sister may be an anima figure, representing the feminine side of your nature.
If the positive aspect of the anima is represented - as a source of wisdom and all-embracing love - the unconscious is inviting you to accept and integrate these good things into your conscious life.
If the anima figure displays a negative - possessive and moody - aspect, the dream is telling you that love (in this case, proper respect for the feminine components of your psyche) can change a negative into a positive. (On anima, see Brother / Sister, sections (4)-(6))
(3) For a man, a dream of incest with your mother may express the desire you felt for her as a small boy. This desire, though repressed, may occasionally surface. Try to accept it as natural and innocent (on the Oedipus complex). Your mother may sometimes symbolize your anima.
See also (2) above, and (7) below.
(4) For a woman, if you dream of incest with your father, it may be an expression of your (repressed) childhood desire for your father. You need to see the innocence of such feelings.
(5) For a woman an act of incest with your brother may be telling you something about your animus, the masculine side of your nature.
If the animus figure is a positive one, it represents the source of all you need for wholeness, if only your feminine and masculine psychic components unite fully at the conscious level.
If the animus figure is a negative one - obstinate, opinionated - you have repressed and neglected your masculine qualities so that they express themselves in uncontrolled and threatening ways; and only love - full respect for them, and allowing them a proper place in your conscious life - can transform negative to positive.
(6) Again for a woman, a dreamed act of incest with your son, or incestuous desires, are probably expressing your anxiety concerning your - natural - sensuous pleasure in the sight and touch of him.
(7) A man’s dreamed or fantasized incest with mother may represent a death-wish, a desire to return into the womb. This means your mother has the properties of the Earth Mother in her negative, devouring aspect; and you really do need to make every effort to throw off an attachment to mother that is preventing the unfolding of your own individual self.
Alternatively, incest with mother in a dream could express a desire for new life: a descent, as it were, into the Earth Mother’s womb for rebirth.