The testatrix, a woman with no spouse or issue, executed a will prepared by an attorney-scrivener. In the residuary clause, she left the remainder of her estate "to my heirs at law living at the time of my decease, to be distributed among them in equal shares, share and share alike." At her death, she was survived by one maternal aunt and numerous first cousins (commonly said to be approximately twenty-five). Prior to execution, the testatrix had reportedly told the attorney that she wished the residue to go to her first cousins, and the scrivener believed the phrase "heirs at law" would effectuate that desire. Under Massachusetts law of intestate succession then in force, however, where a decedent died without issue or parents, a surviving aunt was closer in degree of kinship than first cousins and thus constituted the sole heir at law. After the will was admitted to probate, the cousins contended that the will should be construed to include them based on the testatrix's expressed instructions or, alternatively, that there was an ambiguity allowing admission of extrinsic evidence. The executor resisted, asserting that the phrase "heirs at law" unambiguously identified the aunt as the sole taker.
When a will's residuary clause leaves property to "my heirs at law" and, applying that technical term, a single heir is ascertainable, may a court admit extrinsic evidence of the testatrix's contrary intent (e.g., to benefit first cousins) to vary the clear language of the will on the theory of latent ambiguity or mistake?
In construing wills, words are given their ordinary or, if applicable, technical legal meaning unless the instrument indicates a different intent. Extrinsic evidence is inadmissible to vary or contradict the unambiguous language of a will. Such evidence may be consulted only to resolve a genuine ambiguity—patent on the face of the instrument or latent arising upon application of the language to external facts—or to identify persons or property described where more than one subject fits the description. Absent statutory authority, a court will not reform a will to correct a scrivener's mistake or otherwise conform the instrument to an unexpressed intent.
No extrinsic evidence was admissible because the will was unambiguous. The phrase "heirs at law" has a fixed legal meaning and, applied to the facts, identified the testatrix's sole surviving aunt as the only heir at law. The aunt took the residuary estate; the first cousins took nothing under the residuary clause.
The court began by recognizing that "heirs at law" is a technical term that signifies those persons who would take the decedent's real property by intestate succession at the time of death. Nothing in the will suggested the testatrix intended to use the term in a nontechnical sense or to substitute "first cousins" for the legally defined class. The additional wording "in equal shares, share and share alike" did not create ambiguity; it merely directed the mode of division if there were multiple heirs, and it did not convert the technical class into a different one. Applying the statute of descent, the testatrix's aunt, as a nearer relative than first cousins, was her sole heir at law. The court rejected the cousins' attempt to introduce testimony from the drafting attorney about the testatrix's alleged intention to benefit the cousins. That testimony would contradict the unambiguous terms of the will and effectively reform the instrument based on parol evidence, which Massachusetts law does not permit in the absence of an ambiguity. The fact that the scrivener may have erred in choosing words, or that the testatrix may have misunderstood the legal effect of "heirs at law," did not create a latent ambiguity. A latent ambiguity arises when the language is clear on its face but uncertainty appears when applying it to external facts (e.g., where two or more persons or things fit the description). Here, by contrast, application of the technical term to the known family tree produced a single, determinate taker. The court thus gave effect to the will as written, emphasizing the policy of certainty in testamentary dispositions and the risk of perjury and unreliability inherent in posthumous statements of intent.
Mahoney v. Grainger is a leading authority for three propositions central to wills doctrine: (1) technical terms in wills are presumed to be used in their legal sense; (2) extrinsic evidence is inadmissible to contradict or vary unambiguous testamentary language and is permitted only to resolve genuine patent or latent ambiguity; and (3) courts will not reform wills to correct scrivener's errors absent statutory authorization. The case highlights the sharp line between a testator's subjective intent and the objective manifestation of intent in the executed instrument. It also serves as a drafting caution: if a testator intends to benefit "first cousins" or "next of kin," those words should be used instead of the technical term "heirs at law." Law students study Mahoney to master the ambiguity framework, to appreciate the policy tradeoffs favoring certainty and administrability over individualized intent, and to contrast traditional no-reformation rules with modern reforms in some jurisdictions that now allow reformation for mistake upon clear and convincing evidence.
Mahoney v. Grainger exemplifies a formalist approach to testamentary interpretation: where a will uses a technical term with a clear legal meaning and its application yields a definite result, courts will honor the text rather than reshape it based on extrinsic assertions of intent. The decision underscores that a testator's legally effective intent is the one expressed in the executed instrument, not what the testator may have told the scrivener.