Parenting Plan Modification: “Changed Circumstances” Turns on the Children’s Impact, Not the Source of the Change

Introduction

In re the Parenting of G.L.M.S. and T.L.S., Minor Children (Mont. 2026 MT 23N) arises from a post-decree dispute between Thomas Steiger (father; petitioner/appellant) and Hope VanDelden (mother; respondent/appellee) over modification of a parenting plan for their two children (ages nine and thirteen).

The original Final Parenting Plan (“First Plan”) was entered after a 2017 hearing that VanDelden did not attend, resulting in the children primarily residing with Steiger. Years later, VanDelden sought modification, asserting greater involvement and changed circumstances—particularly improved stability in housing, relationships, and employment flexibility— and the children’s desire for more time with her.

The key legal issues were whether the District Court correctly found (1) a statutory “change in circumstances” under § 40-4-219, MCA sufficient to reopen and amend the plan, and (2) that the amended plan served the children’s best interests under § 40-4-212, MCA, all under the deferential abuse-of-discretion standard.

Important procedural note: The Supreme Court designated this decision a memorandum opinion under its Internal Operating Rules; it is noncitable and does not serve as precedent. Nonetheless, it illustrates how settled Montana standards are applied when a record is developed after an earlier default plan.

Summary of the Opinion

The Montana Supreme Court affirmed the District Court’s July 11, 2025 order granting VanDelden’s motion to amend the parenting plan. It held the District Court did not abuse its discretion in determining that circumstances had changed since entry of the First Plan and that an equal-time arrangement was in the children’s best interests.

Central to the Court’s affirmance was the District Court’s post-remand evidentiary hearing (required by the Supreme Court’s earlier decision), its assessment of conflicting testimony, and its credibility determinations—particularly its finding that VanDelden’s testimony was more credible and that Steiger’s claims of worsening child performance under equal time were not substantiated.

Analysis

Precedents Cited

  • In re G.L.M.S., 2025 MT 10, 420 Mont. 215, 562 P.3d 1058 (In re G.L.M.S. I)

    This was the controlling procedural backdrop. In In re G.L.M.S. I, the Court reversed an earlier amended plan because the District Court modified the parenting plan without first holding an evidentiary hearing. On remand, the District Court held the required hearing and then entered the order now affirmed. The precedent’s influence here is straightforward: it enforced the procedural requirement that contested parenting plan modifications be supported by an evidentiary record, not solely in-chambers impressions or pleadings.

  • In re Marriage of Bessette, 2019 MT 35, 394 Mont. 262, 434 P.3d 894

    Bessette supplied the governing standards of review and the breadth of district-court discretion in parenting matters under §§ 40-4-212, -219, and -220, MCA. The Court reiterated that parenting plan determinations are reviewed for clear abuse of discretion, and that an abuse may arise from clearly erroneous fact-finding, legal error, arbitrary decision-making, or exceeding the bounds of reason resulting in substantial injustice. By anchoring its review in Bessette, the Court signaled that the appeal turned less on reweighing evidence and more on whether the District Court stayed within its discretionary lane.

  • In re Marriage of Oehlke, 2002 MT 79, 309 Mont. 254, 46 P.3d 49

    Oehlke reinforced appellate deference where the case hinges on conflicting testimony and witness credibility. The Court emphasized it will not substitute its judgment for the district court’s resolution of evidentiary conflicts—especially where the trial judge directly heard testimony and assessed demeanor, consistency, and corroboration.

Legal Reasoning

1) Threshold requirement: “change in circumstances” under § 40-4-219, MCA

The statutory test provides that a court may amend a prior parenting plan if it finds, based on facts arising since the prior plan (or unknown at the time), that (a) a change has occurred in the circumstances of the child and (b) amendment is necessary to serve the child’s best interests.

Steiger’s principal argument was that the District Court improperly “manufacture[d] changed circumstances” by relying on developments connected to the earlier reversed plan. The Supreme Court rejected that framing and articulated the opinion’s most instructive principle: the relevant inquiry is not how the changed circumstances developed, but how they impacted the children.

The Court then identified why the District Court could reasonably find the threshold met:

  • The First Plan was entered effectively by default after VanDelden’s nonappearance; she later testified she was moving and did not receive notice. Her subsequent participation provided information previously missing from the record.
  • VanDelden presented credible evidence that her home environment and employment flexibility had “improved substantially” since the First Plan.
  • The court had a meaningful basis to compare how the children functioned under different schedules, including the period of alternating weeks during the earlier appeal.

2) Best interests determination under § 40-4-212, MCA

On best interests, the Supreme Court emphasized trial-level factfinding and credibility: under M. R. Civ. P. 52(a), appellate courts must give “due regard” to the district court’s opportunity to judge witness credibility. The District Court credited VanDelden’s testimony that the children did better in school and extracurriculars with equal time, and it found no evidence supporting Steiger’s claim of worsening performance.

Additional best-interests-related considerations supporting the District Court’s exercise of discretion included:

  • Communication and cooperation: the court assessed disputed medical-appointment communications and implemented Our Family Wizard to improve co-parent communication.
  • Caregiving structure: the court evaluated the children’s time with their grandmother and—by agreement—removed her as a back-up caregiver, refining the caregiving plan.
  • Children’s preferences and emotional ties: after interviewing G.L.M.S., the court found the children loved both parents and wanted more time with VanDelden.
  • Overall conclusion: it was in the children’s best interests to have “equal contact with each parent.”

Impact

Although nonprecedential, the decision has practical implications for Montana parenting-plan litigation:

  • Record development matters: when an original plan is entered with limited participation (including default-like circumstances), later evidence correcting informational gaps can support a finding of changed circumstances—particularly where it bears on the children’s functioning and welfare.
  • “Changed circumstances” is child-centered: litigants should focus arguments on concrete effects on the children (school performance, stability, routines, health care coordination), not merely the procedural history or the “source” of change.
  • Credibility is often dispositive on appeal: where testimony conflicts, appellate review is constrained; trial-level corroboration (messages, records, exhibits) can be outcome-determinative.
  • Tools and targeted provisions are fair game: orders may include practical mechanisms (e.g., co-parenting communication platforms) as part of tailoring best-interests outcomes.

Complex Concepts Simplified

  • Memorandum opinion (noncitable): a streamlined decision used when the court views the outcome as controlled by settled law. It resolves the parties’ dispute but is not precedent.
  • “Change in circumstances” (§ 40-4-219, MCA): a threshold showing that something materially different has arisen (or was previously unknown) such that revisiting the plan is justified. This case highlights that courts concentrate on the children’s real-world impact, not technicalities about how the change came about.
  • Best interests (§ 40-4-212, MCA): the guiding standard in parenting decisions; courts weigh factors tied to the child’s welfare, stability, relationships, and functioning.
  • Abuse of discretion: a deferential appellate standard; the appellate court does not redo the trial but checks for clear factual error, legal error, arbitrariness, or unreasonable outcomes.
  • Rule 52(a) deference: because the trial judge sees and hears witnesses, appellate courts generally defer to credibility calls unless clearly unsupported.

Conclusion

The Supreme Court affirmed the parenting-plan modification because the District Court complied with the required evidentiary-hearing procedure, permissibly found changed circumstances under § 40-4-219, MCA, and acted within its discretion in concluding equal parenting time served the children’s best interests under § 40-4-212, MCA. The decision’s key instructional point is that, in assessing “changed circumstances,” courts focus on the effect on the children—and appellate review will rarely disturb a well-supported best-interests determination grounded in credibility findings and a developed record.