Adult Guardianship Removal in New Hampshire: RSA 464-A:39 Requires Only a “Best Interests” Showing—Not “Cause”

Case: In re Guardianship of T.M., 2026 N.H. 23 (N.H. June 10, 2026)
Court: Supreme Court of New Hampshire
Subject: Standard for removing a guardian of an adult under RSA 464-A:39

1. Introduction

This appeal arose from a long-running adult guardianship involving T.M. (“the ward”). The petitioner (the ward’s mother) sought to remove the Office of Public Guardian (OPG) as guardian of the person and to be appointed successor guardian under RSA 464-A:39.

The central legal issue was narrow but consequential: must a movant prove “cause” to remove an adult guardian, or does the statute require only a determination that removal would be “in the ward’s best interests”? The trial court denied the mother’s 2024 motion largely because she failed to show “cause” or “good cause” to remove OPG. The Supreme Court vacated and remanded, holding that the statute imposes no “cause” requirement.

2. Summary of the Opinion

The New Hampshire Supreme Court held that RSA 464-A:39 does not require a party seeking removal of an adult guardian to prove “cause.” The statute’s “sole inquiry” is whether removal would be in the ward’s best interests. By requiring the mother to show cause/good cause, the trial court effectively added a statutory element not enacted by the legislature. The Court therefore vacated the denial order and remanded for proceedings applying the correct standard.

3. Analysis

3.1. The New Rule/Precedent Established

3.2. Statutory Framework: What RSA 464-A:39 Requires

The Court anchored its interpretation in the text:

• RSA 464-A:39, I(c): a guardian serves until “[t]he court finds removal of the guardian to be in the ward’s best interests.”
• RSA 464-A:39, III: any interested person may move for removal “if removal would be in the ward’s best interests.”

The Court read the statute as written: the legislature selected best interests as the governing standard and did not include “for cause” language. The trial court’s “cause” requirement therefore conflicted with the statutory text.

3.3. Contrast with Minor Guardianships: Why the Legislature’s Word Choice Matters

The Court reinforced its textual reading by contrasting adult guardianships (RSA ch. 464-A) with minor guardianships (RSA ch. 463):

• RSA 463:14, I (minors): service continues until “removal by the court for cause.”
• RSA 463:14, IV (minors): interested persons may petition for removal “for cause.”

Because the legislature expressly used “for cause” in the minor-guardianship statute but omitted it from RSA 464-A:39, the omission was treated as intentional. This is classic textual inference: when the legislature uses specific language in one context and omits it in another, courts generally do not insert the missing term.

3.4. Precedents Cited (and How They Shaped the Decision)

A. Issue Preservation

• In re J.D., 175 N.H. 108, 111 (2022)
  The Court used In re J.D. to apply the preservation rule: appellate review is proper when the trial court had an opportunity to consider and correct the alleged error. Here, the mother objected at the structuring hearing to the “cause” framework (even if not with perfect phrasing), prompting an on-the-record ruling. That sufficed to preserve the issue.

B. Statutory Interpretation Methodology

• In re Guardianship of K.C., 177 N.H. 353, 355 (2025), 2025 N.H. 22, ¶5
  This case supplied the controlling interpretive principles: de novo review; plain meaning; and the admonition that courts will not “add language that the legislature did not see fit to include.” The Court relied on this to reject “cause” as an extra-textual requirement.

C. Interpreting a Trial Court Order

• In re Guardianship of D.E., 173 N.H. 550, 563 (2020)
  The Court cited In re Guardianship of D.E. for the proposition that interpretation of a trial court order is reviewed de novo. That standard mattered because OPG argued the trial court merely described evidentiary considerations for best interests; the Supreme Court, reading the order itself, concluded the trial court in fact imposed a “cause/good cause” requirement.

D. Res Judicata / Claim Preclusion (Footnote Discussion)

• In re Juvenile 2004-637, 152 N.H. 805, 808 (2005)
  Used to define the core idea of res judicata: a final judgment is conclusive in later litigation involving the same cause of action.
• In the Matter of Hampers & Hampers, 166 N.H. 422, 429 (2014)
  Cited for the scope of claim preclusion—claims litigated or that could have been litigated.
• McNair v. McNair, 151 N.H. 343, 352-53 (2004)
  Also cited for the breadth of claim preclusion.

These cases collectively supported the Court’s rejection of OPG’s procedural argument: OPG attempted to use res judicata not to bar the mother’s claim for removal, but to bar a particular legal argument about the statutory standard. The Court found that application unpersuasive given the doctrine’s focus on claims/causes of action.

E. The Trial Court’s Reliance on Prior Guardianship Language

• In re Guardianship of Luong, 157 N.H. 429, 436 (2008)
  The trial court cited Luong for the proposition that if a court believes guardians are not acting in the ward’s best interests (or have a conflict), it may consider whether they should continue. The Supreme Court clarified that Luong did not alter RSA 464-A:39 or create a “cause” requirement—especially because Luong involved a different question (adoption of an estate plan) rather than the statutory standard for removal.

3.5. Legal Reasoning: Why “Best Interests” Is Broader Than “Cause”

The Court’s reasoning is best understood as a boundary-setting decision:

• Text controls: “Best interests” is the statutory test. Adding “cause” changes the legal threshold and risks insulating incumbents absent wrongdoing.
• Cause is relevant but not required: The Court expressly acknowledged that “cause” (e.g., misconduct, conflict, failure to perform duties) may be evidence supporting removal as in the ward’s best interests. But it is not a mandatory element.
• Independent best-interests pathway: The Court recognized scenarios where removal could be in the ward’s best interests even if the incumbent has not committed removable “fault”—for example, changed circumstances, improved availability of a more suitable guardian, or evolving needs of the ward.

3.6. Impact

• Lower burden framing in adult-guardian removal motions: Litigants and courts must frame (and decide) adult-guardian removal requests around a global best-interests inquiry, not a threshold showing of “cause” or “good cause.”
• Doctrinal clarity between adult and minor guardianships: The decision draws a sharp statutory distinction: “for cause” is a minor-guardianship feature (RSA 463), not an adult-guardianship requirement (RSA 464-A).
• Practical effects for public guardians and family successors: Public guardians (like OPG) cannot rely on a “no cause shown” defense if the court finds replacement better serves the ward. Conversely, movants still must persuade the court that removal affirmatively serves the ward’s best interests—an inquiry that can remain demanding even without “cause.”
• Remand posture matters: The Supreme Court did not resolve whether the mother should be appointed; it required only that the trial court redo its analysis under the correct legal standard.

4. Complex Concepts Simplified

• “Best interests”: A flexible standard directing the court to choose the outcome that best serves the ward’s welfare and needs. It is broader than fault-based standards and can account for changing circumstances.
• “Cause” / “good cause”: A fault-leaning concept often meaning some justification such as wrongdoing, conflict of interest, neglect of duties, or other deficiency. This opinion holds it is not a required element for adult-guardian removal under RSA 464-A:39.
• Preservation: To raise an issue on appeal, a party generally must have raised it in the trial court in a way that allowed the judge to address it. Here, the mother’s objection at the structuring hearing was enough.
• De novo review: The appellate court decides the issue fresh, without deferring to the trial court’s legal conclusions (used here for statutory interpretation and interpretation of the trial court’s order).
• Res judicata (claim preclusion): A doctrine preventing re-litigation of the same claim (or claims that could have been brought) after a final judgment. The Court rejected using it to bar a legal argument divorced from claim preclusion.

5. Conclusion

In re Guardianship of T.M. establishes a clear interpretive rule for New Hampshire adult guardianships: removal under RSA 464-A:39 turns on the ward’s best interests, not on proving “cause.” The Court enforced statutory text, distinguished adult from minor guardianship schemes, and clarified that “cause” may be evidentiary but cannot be transformed into a legal prerequisite. On remand, trial courts must apply a broad best-interests analysis unburdened by an extra-statutory “cause” threshold.