Wisconsin Court Upheld Posthumous Paternity Ruling

The appellate ruling confirmed that genetic testing can establish inheritance rights for individuals after a parent dies.

Updated on Sept. 28, 2026 in Life Sciences

Bold flat-color editorial illustration of a brass DNA double helix above blank parchment, representing the role of science in probate law. — The Wisconsin Court of Appeals confirmed that genetic testing may establish paternity for inheritance purposes, even after a parent has died. AI Illustration. Upload story photo >

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The Wisconsin Court of Appeals has affirmed a ruling that designates Dorothy Becher as the sole heir of Joseph Gaigg. The decision relied on posthumous genetic testing to confirm paternity, overriding challenges regarding statutory time limits.

Why it matters

This decision clarifies how modern genetic evidence interacts with probate law in Wisconsin. It reinforces the role of science in resolving estate disputes for individuals who died without a will.

Genetic testing provided a 99.99% probability of paternity for Dorothy Becher. This diagnostic figure surpassed the threshold required to establish heirship despite the 19-year statutory window cited by opposing claims.

The players

Dorothy Becher

The individual confirmed as the sole heir of Joseph Gaigg through posthumous genetic testing.

Joseph Gaigg

The deceased individual whose intestate estate was subject to a paternity establishment motion.

Wisconsin Court of Appeals

The state-level judicial body that affirmed the admissibility of posthumous genetic evidence.

The details

The court permitted the paternity establishment motion as part of a probate proceeding, a legal process for settling the estate of a deceased person. Statutory amendments in Wisconsin now expressly authorize genetic testing to rebut legal presumptions of paternity for deceased individuals. This process allows courts to integrate biological data into inheritance law, ensuring the genetic reality of the relationship overrides procedural bars to paternity claims.

Joseph Gaigg died intestate in 2022.
The Wisconsin Court of Appeals issued the ruling on September 28, 2026.

The Tech Race

The ruling establishes a precedent regarding how biological evidence interacts with long-standing probate statutes. It clarifies that forensic genetic verification is compatible with the 19-year limit defined under Wis. Stat. § 893.88.

This precedent clarifies that heirs in Wisconsin can use genetic testing to resolve estate disputes even years after a death. It ensures that biological paternity evidence is legally admissible during probate proceedings.

The takeaway

This case highlights the increasing integration of genomic data into state legal frameworks for resolving property rights. Residents can now anticipate that genetic evidence carries weight in probate challenges, effectively updating how courts manage inheritance disputes long after an individual has died.