Finding out that a spouse, child, or other close family member was left out of a will can feel personal, confusing, and deeply unfair. In some situations, the omission was intentional. In others, it happened because the will was drafted years earlier and never updated after a marriage, birth, or adoption.
That is where omitted heir claims come in. In general terms, these claims involve state laws that may protect certain family members who were unintentionally left out of an estate plan. The exact rules vary a lot by state, but many probate systems recognize that major life changes often outpace old estate documents.
In this post you’ll learn what an omitted heir claim is, who may qualify, how these claims usually work, what evidence often matters, and why probate deadlines can make timing especially important. If you want a broader overview of how these rules developed, this plain-English explainer on when a spouse or child may still have rights after being left out helps connect the larger picture.
<aside> 💡 Scroll to the bottom for every post in this series.
</aside>
An omitted heir claim is a probate claim asserting that a person who was left out of a will is still entitled to inherit under state law.
Legal sources often use the term “pretermitted heir” for this situation. The Legal Information Institute at Cornell explains that an omitted heir is commonly a child omitted from a decedent’s will who would otherwise have inherited under intestate succession. Cornell also notes that many states have statutes protecting omitted heirs in some form, usually on the theory that the omission may not have been deliberate.
That general definition is important, but the details are where cases often turn. In many states:
Some states use “omitted heir” mainly for children. Others address spouses in separate “omitted spouse” statutes. California is a useful example because its Probate Code treats both categories within family-protection provisions. Under California Probate Code section 21620, a child born or adopted after execution of the decedent’s testamentary instruments may receive a share equal in value to what the child would have taken had the decedent died intestate, subject to statutory exceptions. California separately protects certain surviving spouses who married the decedent after execution of the estate documents under Probate Code section 21610.
These disputes often happen because estate plans lag behind real life.
According to Caring.com’s 2025 Wills and Estate Planning Study, only 24% of survey respondents said they had a will in 2025, and family expansion through birth or marriage was among the leading reasons people updated their estate plans. The same study also reported that many adults still had no estate planning documents at all.
That combination creates a familiar probate problem: a person writes a will, life changes, and the documents never catch up. A new child is born. A stepfamily forms. An adoption is finalized. A second marriage happens later in life. Then death occurs before the paperwork reflects the new reality.
From a probate court’s perspective, omitted heir statutes are often designed to address exactly that kind of gap. An American Bar Association probate update recently discussed pretermitted-heir case law and noted how heavily these cases can turn on evidence of intent in the governing instrument.