“Drivers need to be listed on a policy if they’re a regular operator of the vehicle. The definition of “regular operator” may vary from company to company, but it usually means they drive the car one time or more per month on a regular basis. This is true whether they live in the household or not. If your son is listed as an active driver on your policy, he may be added as an inactive driver or non-driver on his girlfriend’s family’s policy; depending on the company there may be no additional cost.”