RENO - Stefphon Jefferson had more to worry about Saturday afternoon than just the California Golden Bears defense.The Nevada Wolf Pack running back, the Mountain West Conference Offensive Player of the Week after rushing for 147 yards and three two-yard touchdowns in a 31-24 upset victory in Berkeley, Calif., got some disturbing news Saturday morning."I got the call from my sister at breakfast before the game," the Wolf Pack junior said. "My family was involved in a car accident. They hit a diesel (truck) and had to go to the emergency room."Jefferson played against Cal without knowing the full extent …