Final answer:
Seeking professional counseling is one healthy action that could help Nathan cope with the stress of his parents' divorce.
Step-by-step explanation:
One healthy action that could help Nathan cope with the stress of his parents' divorce is to seek professional counseling. Professional counselors are trained to support individuals who are going through challenging life events, such as divorce. They can provide a safe space for Nathan to express his feelings, develop coping strategies, and navigate the difficulties that may arise during this time.