It would depend on the damage and how it occurred. If it happened while towing or trying to retrieve keys locked in the vehicle then they are not responsible.
Yes, you are responsible for all the damage caused by your accident therefore if an object you hit goes on to cause further damage as a result of being hit then you are responsible for all the damage.
The driver of the first striking car is responsible for all subsequent damage.
the person who drove the car he is responsible he signs a form to say that he is responsible for what happens when they drive the car
towing company should have insurance
If you purchased the rental company's insurance option then the rental company's insurance is responsible. If you did not purchase the insurance option, then YOUR insurance is responsible.
your mother
The underaged driver's parents are responsible for the damage to the car.
you are
The tow company is responsible for damage they did to the vehicle, if they claim they didn't do it you have to prove it and make a claim/sue them, otherwise you need to claim it on your insurance.
Obviously the person who caused the damage is responsible. If I thought my neighbor's homeowner's insurance would pay for my car if it is wrecked on his property, I'd drive it right into the side of his house!
It depends on the situation. The rider is responsible for his actions while on the bike, but if the bike rider has the right of way and crashes into a car that has failed to yield then it's the car driver whose responsible both for the damage to the car but also to the bike.
One can find information about AAA car rentals on the official AAA website. The website provides car rental rates and information about renting a car.