1995 Chrysler LHS transmission problems

My vehicle was parked, not running and no key in the ignition. My son went into the vehicle and accidentally hit the gear selector knocking the transmission in reverse. He got out of the car and it was rolling backwards. He attempted to stand behind the vehicle to stop it and was knocked clear of said vehicle. The vehicle rolled down a hill and into a house. The gear selector can be taken out of park with no key in the ignition and no foot on the brake pedal.

This vehicle was purchased used. 2 weeks after purchase the rear brake bads failed causing them to grind on the rotors. Brakes and rotors were replaced. Drivers side seat support is broken. Power steering pump has a leak. Transmission clutches burned out requiring replacement. Water pump failed along with failing timing belt & timing belt tensioner causing needed replacement. Engine has several oil leaks. Rack & pinion system is shifting, causing a thumping sound and vehicle shifting while cornering at times.