The transmission is not in park and/or the parking brake is not applied.
Power steering belt?
I would start with the car and then move to the homeowners.
to be parked
When a moving car hits a parked car, energy is transferred from the moving car to the parked car. The kinetic energy of the moving car is transferred to the parked car, causing it to move. Some energy is also converted into other forms, like sound and heat, during the collision.
When a moving car hits a parked car and causes it to move, the kinetic energy of the moving car is transferred to the parked car. This increase in kinetic energy causes the parked car to start moving. Some of the energy is also dissipated as sound, heat, and deformation of the cars during the collision.
It would be the car who had parked illegally because he was not parked in a legal spot.
You cannot move a car that is not yours from where it has been parked. You might have to look for the owner and let him remove the car. If you're talking about repossession agents, they are NOT allowed to enter or move any vehicle other than the one they are there to repossess. You can move that car if you want to go somewhere immediately you can call up a lifter and lift that car up and move your car.
Of course it is your fault. The fact that the car was illegally parked is of no consequence. You didn't look where you were backing or you would not have hit the parked car. Would you have hit this car if you had been looking? Perhaps the illegally parked car is a Mini Cooper, parked illegally 1 foot behind a Hummer and therefore not visable when the driver looks before backing up...
Generally speaking, the driver in motion is considered to be at fault when a parked car is hit, even if the car was parked illegally. The exception to this would be if the car was parked in a dangerous, hard-to-see location and the driver in motion could not have reasonably avoided hitting it. For example, if a car is parked on a sharp curve in the travel lane of a narrow road, and the driver of a car driving around the curve at the speed limit would not be able to see the parked car until too close to it to avoid a collision, then the driver might not be liable for damage to the parked car, and indeed the driver who parked the car might be liable for damage to the car that hit it.
As long as the parked vehicle is parked properly and not illegally parked in any manner, then the vehicle that rear-ended the parked car is at fault. Now if the parked car is sitting illegally (such as double parked or parked in a no parking zone, etc.) then the parked car is at fault or even both the parked car AND the car that hits it are BOTH at fault.
Backwards, then forwards from the rebound.
I think it would have to be the person who hit your car because they caused your car to crash into the other car.