How DNA Tests Are Transforming Inheritance Laws in the US

How DNA Tests Are Transforming Inheritance Laws in the US

SimplyTrustSimplyTrust Editorial·December 22, 2025·3 min read

Discover how DNA testing is reshaping inheritance laws and what it means for your estate planning.

The Surprising Impact of DNA Testing on Estates

Imagine receiving a DNA testing kit as a gift and discovering you’re entitled to a share of a multi-million dollar estate. This scenario is becoming increasingly common as consumer DNA tests like 23andMe and Ancestry reveal hidden family connections. In some cases, individuals are emerging as surprise heirs, challenging long-established estate plans and shaking up the legal landscape of inheritance.

Redefining Family Dynamics

The introduction of direct-to-consumer genetic testing is reshaping what it means to be part of a family. No longer limited to traditional family trees or holiday gatherings, the definition of family now includes biological relatives uncovered through DNA testing. As these newfound connections come to light, they often lead to legal disputes, particularly when the deceased did not have a solid estate plan in place.

Real-Life Court Cases Making Headlines

Several recent court cases highlight the ramifications of this trend. For instance, in Massachusetts, a woman named Carmen Thomas discovered two half-sisters through a DNA test and sought a portion of a $28 million estate linked to their late father’s medical malpractice award. Her case is pivotal in determining how courts will respond to late-discovered heirs in the context of existing estate structures.

In Colorado, a man excluded from his father’s estate used DNA evidence to prove paternity and claim his share of the estate, including a family cabin. These real-life examples showcase the growing need for estate planners to anticipate potential claims from unknown relatives and adjust their plans accordingly.

Legal Implications for Estate Planners

For estate planners, the implications are significant. The traditional methods of planning for inheritance may need a rethink. With the rise of DNA testing, it’s essential to consider how these tests can uncover relationships that were previously thought to be non-existent or intentionally hidden. Families must be proactive in crafting clear, comprehensive estate plans that address potential claims from newly discovered relatives.

Action Steps for Families

As DNA tests continue to gain popularity, families should take steps to protect their estates. Consider these actions:

  • Review your estate plan regularly to ensure it reflects current family dynamics.
  • Communicate openly with family members about your wishes and the importance of an up-to-date estate plan.
  • Consult with an attorney who specializes in estate planning to navigate the complexities introduced by genetic testing.

Taking proactive steps now can help mitigate conflicts later and ensure that your wishes are honored, regardless of any surprises that may come to light in the future.

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