In my book, The Forgiving Life, I recommend an exercise that I call the Forgiveness Landscape in which you begin to think about all of the people who have ever been unjust to you. You rate what the injustice is and how deeply that injustice hurt you. You then order these people from the least-severe hurt to the most-severe hurt. You start with the least-severe hurt and begin the forgiveness process with that person. Once you finish the forgiveness process with that one person, you move up to the next person, and then the next until you are experienced enough with forgiveness to start forgiving those who have been the most hurtful to you. This exercise may prove worthwhile for your wife. In other words, she does not start with the parents. As she forgives others, who are less hurtful to her, then her psychological defenses toward her parents, in which she may have been denying the degree of hurt, may change so that she sees the deeper hurt that she has. At that point, she may have the strength, the resolve, and the expertise to forgive the parents. At that point, the nightmares may end. I wish both of you the best on this forgiveness journey.