Final answer:
The nurse should first explain ICU visitation policies and encourage family visits.
Step-by-step explanation:
In this situation, the nurse should take the action of explaining ICU visitation policies and encouraging family visits as the first step. This allows the nurse to establish a connection with the family, provide them with important information, and help reduce their anxiety or concerns. By explaining the visitation policies, the nurse can also set appropriate expectations for the family's presence in the ICU.