In our experience, we have not to date encountered this situation and we have worked with many teachers across the world. If it were to happen, I suggest that you explore, if the parents are willing, their assumptions about forgiveness education. Do the parents think that you are teaching the child a particular religion? Another issue you might consider is this: Are the parents angry about something or someone in their own life and so are opposed to they, themselves, forgiving? You do not want to become the parents’ therapist, of course, but being aware of their possible anger will at least be an insight for you. At some point, you could consider saying, “Sometimes people have been deeply hurt by others and so they do not want to forgive. They consider it too painful and they are not ready.” It then is up to the parents to take this and work with the insight or not.