Any time the driver who is backing is at fault, in all 50 states.
both of you for not looking back
The person backing out. If you were in the lane/road behind them they needed to use caution when backing out.
The guy that is walking.
You if you were backing up. If you were waiting at a stop sign or stoplight or even an entrance and someone else hit you, it would be the person behind's fault.
Not in a public parking lot. But if it is a controlled parking low where the employees park and retrieve the cars, the lot owner is responsible. He probably has a sign posted saying he is not responsible for accidents, but he is.
Your mum, Steve.
The driver backing up. Unless you can prove the other car was driving unsafly.
Depends on the jurisdiction, but typically, two vehicles backing up is a 50/50.
yes you are correct. the person backing up is responsible for making sure the area behind their vehicle is clear.
The person driving through. If you're backing out then you do not have the right of way.
I would be interested to see how this plays out. I know my dad was backing out of a parking space slowly because he had two larger cars on either side of him and a driver was driving down the lane in the parking lot and rearended him. The other driver didnt stop for at least 20 feet so he was going pretty fast, but they still gave my dad the ticket for unsafe backing. But if both of you were backing out in a parking lot I dont know how that would play out. Did you guys call the cops? I suppose the cop could have given you both a ticket for unsafe backing??