1998 Ford Expedition transmission problems

While key was in ignition, but engine was not running, a child knocked gear shift lever out of the park gear which allowed vehicle to start rolling in reverse. Vehicle rolled backwards approximately 30 feet, and then started moving forward for an approximate distance of 150 feet. Vehicle crashed into a tree, causing both frontal air bags to deploy from which child sustained minor injuries. Dealership has not examined vehicle. Please provide any additional information / documentation.

Tl* the contact owns a 1998 ford expedition. The contact stated the vehicle was parked with the engine off when it began to unexpectedly roll forward. The contact depressed the brake and utilized the emergency brake as the vehicle came to a stop. The contact stated that the failure would recur whenever the vehicle was sitting idle in the park position.