What should I do if I suspect that my divorced cousin and my son have committed incest while traveling?

This matter makes the boy’s parents very frightened. They should find a way to solve it and it is very difficult. First of all, they cannot expose it in front of their children. In addition, the family scandal must not be made public. The best solution is to use some means to keep him and her alone. If we can't separate, we should openly and honestly make it clear to our cousin that she is an adult with experience and should take responsibility and not ruin a child's life for a short time.