Disagree
Telling the truth is an invaluable trait that many people appreciate. If we are told the truth, we are being respected and trusted, which is the foundation of any relationship. So in most relationship telling the truth is the primary consideration. But in some special situations dealt with life or health, truth may become less important.
Consider a patient with severe disease or even cancer, who cannot adjust himself or herself to confront this kind of shocking truth and easily lose all hope of life. The better way, also the way most people choose, is to hide the diagnosis result from him or her. Without knowing truth can help this patient extend the time of life or increase the rate of survival. Under this circumstance, we regard telling the truth after one's life and health.
However, in general we consider telling the truth the most important. In family relationship, parents should encourage children say out the truth especially when kids do something wrong. At this time children tend to tell a lie to avoid the parents' disappointment and anger. As a result they loose the opportunity to be brave to admit faults, to be educated, and to learn lessons. Correspondingly, parents loose the chance to understand their children's deep inner and educate them. As we know those will have harmful influence on the relationship between parents and children.
As for couples, telling the truth to each other is viewed as the most important. First of all, telling the truth means trust. One person would like to spend time telling truth without reservation to others only if they are trusted and will not take use of this trust to hurt that person. This is the basis for couples with or without married to understand each other. Second when one try to hide the truth even for kindness--except for the other's life of course--misunderstanding could occur and cause disagreeable results.