Wisconsin Statutes & Annotations
Chapter 891 - Presumptions.
891.41 - Presumption of paternity based on marriage of the parties.

891.41 Presumption of paternity based on marriage of the parties.
(1) A man is presumed to be the natural father of a child if any of the following applies:
(a) He and the child's natural mother are or have been married to each other and the child is conceived or born after marriage and before the granting of a decree of legal separation, annulment or divorce between the parties.
(b) He and the child's natural mother were married to each other after the child was born but he and the child's natural mother had a relationship with one another during the period of time within which the child was conceived and no other man has been adjudicated to be the father or presumed to be the father of the child under par. (a).
(2) In a legal action or proceeding, a presumption under sub. (1) is rebutted by results of a genetic test, as defined in s. 767.001 (1m), that show that a man other than the man presumed to be the father under sub. (1) is not excluded as the father of the child and that the statistical probability of the man's parentage is 99.0 percent or higher, even if the man presumed to be the father under sub. (1) is unavailable to submit to genetic tests, as defined in s. 767.001 (1m).
History: 1979 c. 352; 1983 a. 447; 1985 a. 315 s. 22; 1987 a. 413; 1989 a. 212; 1997 a. 191.
In order for a putative biological father to have the necessary foundation for a constitutionally protected liberty interest in his putative paternity, he would have to have taken affirmative steps to assume his parental responsibilities for the child. Randy A.J. v. Norma I.J., 2004 WI 41, 270 Wis. 2d 384, 677 N.W.2d 630, 02-0469.
A genetic test showing another man to be the natural father rebuts the presumption under s. 767.48 (1m) [now s. 767.84 (1m)] and sub. (1) that the spouse of the child's mother is the father, but equitable estoppel may be employed to preclude rebutting the presumption. The issue is whether the actions and inactions of the parties advocating the rebuttal of the marital presumption were so unfair as to preclude them from overcoming the public's interest in the marital presumption based on the results of genetic tests. Randy A.J. v. Norma I.J., 2004 WI 41, 270 Wis. 2d 384, 677 N.W.2d 630, 02-0469.
The presumption that the mother's husband is the child's father does not violate a putative father's due process rights. Michael H. v. Gerald D., 491 U.S. 110, 105 L. Ed. 2d 91 (1989).
If a child is conceived subsequent to the entry of a decree of legal separation, there is no presumption of paternity. Schoenfeld v. Apfel, 237 F.3d 788 (2001).
As I See It: Out of Sync: Assistive Reproductive Technology & Parentage Law. Walsh. Wis. Law. May 2017.

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