Wisconsin statute 115.001 (3g) states, “‘Home-based private educational program’ means a program of educational instruction provided to a child by the child’s parent or guardian or by a person designated by the parent or guardian. An instructional program provided to more than one family unit does not constitute a home-based private educational program”
So, as long as the person you have designated is teaching only your family unit, you may designate the person of your choice to homeschool your children.