Final answer:
Gavin, his daughter, and her friends in the covered auto would be covered for their injuries under Part B of Gavin's Personal Auto policy. The driver and passengers of the other vehicle would not be covered under this part of Gavin's policy.
Step-by-step explanation:
The scenario described involves Gavin, who is the named insured under a Personal Auto policy, and an auto accident that resulted in injuries. Under Part B of Gavin's Personal Auto policy, often referred to as Medical Payments coverage, Gavin himself, his daughter Tabitha, and Tabitha's friends—who were passengers in the insured vehicle—would all be covered for their injuries sustained in the accident.
It is important to note that Part B generally covers the insured person, family members, and passengers in the insured vehicle, regardless of who is at fault for the accident. However, the driver and passengers of the other vehicle struck would not be covered under Gavin's policy for Medical Payments. Instead, they would need to have their own insurance or seek coverage through Gavin's liability insurance if he is found to be at fault for running the stop sign and causing the accident.