Wis. Stat. § 324.35: Grant of physical placement to nonparent.

(1) On the motion of a deploying parent and in accordance with the law of this state other than this chapter, if it is in the best interest of the child, a court may grant physical placement to a nonparent who is an adult family member of the child or an adult who has maintained a relationship similar to a parent-child relationship with the child.

(2) Unless a grant of physical placement to a nonparent under sub. (1) is agreed to by the other parent, the grant is limited to an amount of time not greater than either of the following:

(a) The amount of time granted to the deploying parent under a permanent legal custody or physical placement order, but the court may add unusual travel time necessary to transport the child.

(b) In the absence of a permanent legal custody or physical placement order that is currently in effect, the amount of time that the deploying parent habitually cared for the child before being notified of deployment, but the court may add unusual travel time necessary to transport the child.