Legal Question in Insurance Law in Arizona

Generally speaking, one adult is not responsible for another adult's medical bills simple because they are parent and child. I don't know about your specific situation and whether there are facts that could make it different.

If your son is covered by health insurance, hopefully that will cover his bills. If the accident was not his fault, then he may have a claim against the person who caused the accident (the proceeds of which could help to pay bills).

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I am not your lawyer unless we enter into an engagement agreement in writing. This is general information that is given for legal education only. It is not legal advice, and it may not work for your specific situation. I strongly advise you to consult with a local lawyer to get legal advice and help with your specific situation.