If you are injured in a car accident you may sue any person whose negligence caused your injury. This might be the driver of the other car, the driver of your car if you were a passenger or even multiple drivers if several drivers contributed to your injuries. Under Minnesota law the owner of a car is as responsible as the driver for any actions of the driver.
There are no limitations on what type of person you may sue in Minnesota. This means you may sue your spouse, parents, siblings or anyone else if their negligence contributed to your injuries. Although it may seem unusual to sue a relative, their insurance company is still responsible if their negligent actions caused you to suffer injuries.