It is possible even though he is over 18 years of age. For example, if your son, under these facts, causes a major car accident, with major damages that exceed the policy limits he or you have for his auto insurance, then it is quite possible an attorney would run an asset search and find that he lives at home with you. It is possible that an attorney would then try to go after other insurance coverages you may have (umbrella coverages), or even your home owners insurance. You really cannot...
You will need to file it with the DMV; and you can print up the forms on line at www.dmv.ca.gov. Do not wait for your insurance, and send it in even though it is past the 10 day deadline. You have to file one if the property damage is over $750.00, and/or there is a bodily injury. Make a copy for your records. If you do not file one, you run a risk that your license gets suspended, because the purpose of the SR-1 is to communicate insurance information. I hope this helps!
This is a civil matter. First, you need to report this to your insurance company and explain the facts of what occurred. Let them negotiate the settlement. Since your nephew was under age, he needed to have licensed driver with him over 25 years of age. Let your insurance deal with this and thank your lucky stars the damage was very little as it is very unlikely there will also be an injury claim; but if so, this is just another reason to report everything to your insurance. I hope this helps.
I am assuming you either retained counsel or filed your case in Small Claims court yourself since it appears your statute of limitations expired in October 26, 2009. If you need more information, please post another question.
You have good counsel right now: your insurance company. Wait and see what happens, but you are entitled to periodic updates. Hopefully the case will settle within your policy limits of $25,000.00. Right now you are in "wait and see mode."
I do not believe your case would be worth your valuable time on these facts; moreover, I am assuming you were not physically injured. It will be costly to go against the police on these facts that also needs to be considered. I highly advise you let your insurance company know your version of events.
If you were in the normal flow of traffic, and the other party opened their door while you passed causing it to collide with your car, then the other party is at fault. Let your insurance handle this--give them all the information you have to support what you were doing, and where you were at the time of the impact.
It is normal that they have legal representation. Legal liability will need to be established on these facts. You will need to give all information to your insurance company so they can assign counsel to represent you and protect you on the legal side. Witness statements indicating his speed will certainly help your side on liability.