What to do if my auto insurer denies coverage?

Question Details: My 17 year old son took one of my vehicles while I was out of town. He was involved in a multi-car accident on the freeway but was not issued a citation. My son has a legal address/residence at his mother's. We are divorced and both remarried. I believed that he was covered on his mother's auto insurance policy and would allow him to drive the vehicle to work or school on occasion when needed, however not on this occasion as we were away. He was coming over to watch the dog while we were away for the weekend. Long story short, the insurer said as he used the vehicle on occasion and was not listed on my policy, they are most likely going to deny coverage. Is this correct?

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