Wis. Stat. § 344.38
Whenever any person required to give proof of financial responsibility for the future under this chapter is or later becomes an operator in the employ of any owner, or is or later becomes a member of the immediate family or household of the owner, the secretary shall accept proof given by such owner in lieu of proof by such other person. If the vehicle is leased to the employer, then the leasing company may file proof of financial responsibility on behalf of the person required to furnish such proof. When proof has been given as provided in this section, the person on whose behalf such proof was furnished may be granted a license, but only to operate those vehicles for which proof was so given. The department shall note such restriction on the person's license, including a designation of each vehicle for which proof was given.
Wis. Stat. § 344.38