We can do nothing to change the fundamental patterns in the composite chart. Of course the same may be said of an individual chart. But we seem to have more room to affect the levels on which we express our natal patterns. This gives us the inner sense - valid or not - that we have the power to participate actively in, or even create, our own future. Maybe we do, at least in some areas of life. But a composite presents us with a different experience, if not a different reality at core. We can change how we react to the patterns in the composite, and we can make the effort to provide creative outlets for its energies. But even with the maximum cooperation with a partner, the patterns of a composite still feel "outside" our sphere of personal influence. A composite will not say, "This is a bad relationship - get out of it." But it may say, "This relationship has got an inherent restriction which neither person is going to be able to alter. If you want this relationship, accept this issue." If the composite chart has a Sun-Saturn square or a Sun-Chiron conjunction, it contains built-in limits, often of a very concrete kind. These limits may prove to be creative and positive for either or both individuals. But they feel as though they have been imposed on us. A Sun-Saturn square or a Sun-Chiron conjunction in the natal chart also contains built-in limits, but we experience them differently.
Let's take composite Sun-Chiron aspects. I have seen these many times when a relationship involves the unavoidable inclusion of limits from the past. The past may be an ex-partner who wants big maintenance payments, or it may be children from a former marriage. These situations can cause a lot of pain, especially where children are involved, because no matter how mature and conscious the two people are, there will be conflicts, divided loyalties, hurt feelings, and perhaps also financial restrictions. It is not a question of altering attitudes; a priori families, for any couple, are a built-in fact which will always impose limits. If a couple do not experience limits in such circumstances, then we probably won't see Sun-Chiron in the composite chart.
We know that Chiron is connected with experiences of wounding, particularly those which seem unfair and unmerited, and which are a product of the state of the collective at the time rather than some particular person's fault or act of malice. Sun-Chiron contacts in a composite suggest that the relationship itself carries an unhealable wound, usually from the past of both parties, or from the nature of the world in which the two people are living. At the same time, the relationship may provide deep healing for both people, or for others who come in contact with the couple, because the inherent limits invoke suffering and consequent understanding and compassion.
I have sometimes seen Sun-Chiron in a composite when two people want very badly to have children but are unable to do so. This is a wound which can make people think much more deeply about who they are and what purpose their lives serve, because they do not have the collectively sanctioned "purpose" of a family to give them a direction in life. Another example might be a partnership where there is a great age difference, and the younger partner must watch the other grow old and frail. No amount of love and commitment can turn the clock back. Or there might be a physical handicap in one partner which may be genuinely and deeply accepted, but which limits the mobility of both people. Yet another example might be a racially mixed marriage, or a homosexual relationship, both of which may provoke animosity among neighbours who are xenophobic or too rigid in their definitions of normality. Xenophobia and rigid opinions are characteristic of many, many people, and no amount of agonising or raging will alter this unfortunate flaw in human nature. Both people may be hurt through the relationship, not because it is "bad", but because there is something about the way the relationship "sits" in the collective which limits its possibilities.
I am not saying that it is a static picture. As far as healing is concerned, it depends on what you mean by the word. Chiron's wounds do not heal in the sense of going away. Something has been permanently twisted out of shape, even if the poison has been released and cleansed. One cannot regain innocence once it has been destroyed by the kind of wounding this planet reflects. But one's attitude toward the wound can change, and greater tolerance, compassion, and wisdom can result. That is a kind of healing; but it cannot undo the past. One cannot, for example, make one's children by a former partner vanish in a puff of smoke. One can try to numb the wound by cutting off from the children emotionally, and never seeing them again; and then there is another sort of wound that must be dealt with. Or one can work very hard to face all the emotional complications, and eventually establish rewarding relationships with everyone concerned. But there will always be compromise and sadness and a sense of loss. Such aspects in the composite chart do not mean that the effects of the difficulty remain static and unchanging. Both people may be deeply and permanently transformed. But the past cannot be remade.
from here
