Must I include my son on my car insurance if he sometimes drives my car?

If the vehicle is going to be driven, albeit occasionally, by more than one person, then all the possible drivers must be listed on the policy or, if not all, then the one representing the greatest risk, i.e. the youngest or least experienced driver and/or the one with the worst history behind the wheel. Insurance institutions normally have offers ready-made for these cases and they do not necessarily imply paying a lot more. In any case, it is always better to tell your insurer than to run the risk of having to pay yourself the expenses of an accident caused by your son.