Final answer:
Peter's mother insists that he needs to join a rehabilitation program after his injury.
Step-by-step explanation:
After Peter's injury, his mother insists that he needs to join a rehabilitation program. A rehabilitation program is a specialized program that aims to help individuals recover from injuries, surgeries, or other health conditions. It typically involves a combination of physical therapy, occupational therapy, and other treatments to improve the patient's physical function and overall well-being. In Peter's case, joining a rehabilitation program can help him regain strength, mobility, and independence after his injury.