Wis. Stat. § 767.855
Except as provided in s. 767.863(1m) , at any time in an action to establish the paternity of a child, upon the motion of a party or guardian ad litem, the court or supplemental court commissioner under s. 757.675(2) (g) may, if the court or supplemental court commissioner determines that a judicial determination of whether a male is the father of the child is not in the best interest of the child, dismiss the action with respect to the male, regardless of whether genetic tests have been performed or what the results of the tests, if performed, were. Notwithstanding ss. 767.813(5g) (form) 4 , 767.84(1) and (2) , 767.863(2) , 767.865(2) , and 767.88(4) , if genetic tests have not yet been performed with respect to the male, the court or supplemental court commissioner is not required to order those genetic tests.
Wis. Stat. § 767.855
Parental status that rises to the level of a constitutionally protected liberty interest does not rest solely on biological factors, but rather, is dependent upon an actual relationship with the child where the parent assumes responsibility for the child's emotional and financial needs. Stuart S. v. Heidi R., 2015 WI App 19, 360 Wis. 2d 388, 860 N.W.2d 538, 14-1487.