To insure the car you need to have financial interest in it, ie your wife/husband or mother/son , you cant insure a friends car .
Also as Ethel said, who is going to be the main driver, you also have to be the main driver to insure a car , it is called fronting for instance if a father insures a child in his name but his son is going be the main driver, it is actually illegal and the insurers will refuse to pay a claim in the event of an accident.