Is it a NM requirement to add a newly licensed driver to my car insurance policy if they dont drive my car

My newly licensed son who is 16 drives a car that is insured on my ex husband’s policy. My don doesn’t drive my cars. My insurance company told me that it is New Mexico state law that he has to be insured on my policy just because he lives at my address. I think they are lying to me and I think it is unethical to just add him to my policy no matter what the circumstances. Does NM state law actually require this? I can’t get a straight answer from anyone. Thank you

Asked February 13, 2019