ON MOTION FOR REHEARING
We withdraw our opinion issued May 11, 2007, and substitute the following in its place. The Court has overruled Michels’s motion for rehearing.
This appeal arises within a statutory scheme intended to ensure the best interests of children following their parents’ divorce. It also implicates the principles underlying our adversarial system, which we trust to ensure justice and truth under our law through the refining of issues achieved when parties and their able advocates receive their “day in court” under fair procedures.
Ex-spouses Sheryl Michels and Clifford Zeifman, aided by their respective legal teams, are embroiled in a controversy concerning the best interests of their two children, A.A. and G.L. The background of this controversy is detailed in our opinions in prior proceedings that have arisen from it in recent months. 1 To summarize, Mi- *462 chels and Zeifman “have pursued extensive and acrimonious litigation over which [elementary] school A.A. should attend,” 2 a conflict that evidently has spread to other issues involving both A.A. and a second child, G.L. 3 Informed by the harsh tenor of the litigation and legal expenses that, the record of these proceedings reveal, are spiraling into the hundreds of thousands of dollars, we have previously suggested that “the adversarial processes of our court system,” at least when utilized in this manner, “may not be the best means” of either deciding which school A.A. should attend or of ensuring this young child’s best interests. 4
This latest appeal involves a contention by Zeifman that Michels and her lawyers sought to advance their interests by unethically circumventing the procedural protections that our adversarial justice system provides him. The conduct he alleges is indeed disturbing. In our August 4, 2006 opinion in Cause No. 03-05-00533-CV, we held that, on the record before us, the district court had abused its discretion in modifying the comprehensive terms of the parties’ original agreed divorce decree to give Michels sole power to make educational decisions on behalf of A.A.
See Zeifman v. Michels,
*463 While Miehels’s new lawsuit was directed at controlling Zeifman’s actions — and despite the fact that he was A.A.’s father, joint-managing conservator, and her opposing party in ongoing litigation concerning A.A.’s education — Michels did not name Zeifman as a party. Zeifman represents that, even worse, Michels sought to avoid his notice or detection by deliberately filing her lawsuit on a day — Monday, August 14 — on which “Sheryl and her attorneys were aware” from a vacation letter and prior correspondence “that Clifford’s attorney was out of town attending the Advanced Family Law Course in San Antonio.” 6
At 2:48 p.m. on August 14, Michels obtained an ex parte temporary restraining order against AISD. On the following Friday, August 18, 7 Zeifman filed a petition in intervention, motion to dismiss, and motion for sanctions. Zeifman pleaded that he had a justiciable interest in Michels’s new lawsuit as A.A.’s father and co-managing conservator, and as respondent and counter-petitioner in the ongoing litigation. Zeifman moved to dismiss Michels’s suit as an improper attempt to circumvent the district court’s jurisdiction over the divorce decree and this Court’s jurisdiction over “the issue of [A.A.’s] education.” Zeifman also urged that Michels’s attempt to invoke the district court’s jurisdiction was inconsistent with the position she had taken only a few months earlier in a second modification proceeding she had initiated under the divorce decree in 2005. Specifically, in response to a counter-petition from Zeifman to modify the educational-choice portions of the decree, Michels had filed a plea to the jurisdiction asserting that the district court lacked subject matter jurisdiction over the - counter-petition while the appeal of the decree modifications in No. 05-533 was pending. The district court then “agree[d] that it has no jurisdiction to modify the order addressing the education of [A.A.] because of the current appeal of that matter” but overruled Michels’s plea because it “retains jurisdiction with respect to all other aspects of the parent-child relationship as to both children under Chapters 155 and 156 of the Texas Family Code.” 8
Zeifman sought sanctions under rule 13 of the Texas Rules of Civil Procedure, chapters 9 and 10 of the civil practice and remedies code, and the district court’s inherent power. He complained chiefly that Michels had filed a “frivolous and groundless” separate suit against AISD, rather than seeking relief in the divorce and custody case, to circumvent the jurisdiction of the district court and this Court, and in a manner deliberately calculated to avoid his knowledge or participation for a short, but critical, period of time. Zeifman argues that these tactics, coupled with subsequent events, reveal Michels’s sole design to have been delay. He represents that he had been scheduled to have custody of A.A. during the week of August 14, that classes at Bryker Woods were to begin on August 15, and that custody was scheduled to return to Michels the following week. Thus, *464 Zeifman maintains, Michels filed what proved to be a “one-week lawsuit” solely to prevent him from enrolling A.A. during his custody week and to “buy time” until custody returned to Michels the following week and she could enroll A.A. in St. Andrews.
A hearing on Zeifman’s intervention, motion to dismiss, and motion for sanctions was set on the third business day thereafter, Wednesday, August 23. On Monday, August 21, Michels filed a rule 11 agreement with AISD, dated August 18, whereby the district agreed not to permit A.A. to be enrolled at or attend Bryker Woods “until such time as [AISD] is presented with a final, non-appealable order expressly authorizing such enrollment and attendance,” in return for Michels’s agreement to dismiss her pending suit. Michels filed a notice of non-suit on August 22 and, on the day of the hearing, filed a motion to strike Zeifman’s intervention. After a hearing in which only argument was presented, the district court signed an “Order Confirming Nonsuit” and, by separate order, granted Michels’s motion to strike intervention, dismissed as moot Zeifman’s motion to dismiss, and denied Zeifman’s motion for sanctions.
Zeifman brings two issues, contending that the district court abused its discretion in striking his intervention and in denying his sanctions motion. We agree that the district court abused its discretion in striking Zeifman’s intervention. Furthermore, because this ruling was undisputedly a predicate for the district court’s ruling on Zeifman’s sanctions motion, we remand Zeifman’s sanctions motion for further proceedings.
As this Court has previously observed, the right of intervention is ultimately rooted in equity.
Highlands Ins. Co. v. Lumbermen’s Mut. Cas. Co.,
Sufficient cause exists for striking an intervention when a would-be inter-venor faced with a motion to strike cannot demonstrate a justiciable interest in the lawsuit.
Mendez v. Brewer,
*465
While the determination of whether a justiciable interest exists based on the pleadings would appear to present a pure question of law,
cf. Texas Dept. of Parks & Wildlife v. Miranda,
During oral argument, Michels conceded that Zeifman had shown a justi-ciable interest in her suit against AISD, at least at its inception. Zeifman’s justicia-ble interest is obvious from the face of his petition, if not from Michels’s own petition. Michels’s suit sought to prevent Zeifman from enrolling A.A. in Bryker Woods or other AISD schools. Both Zeif-man and Michels pleaded that Zeifman is A.A.’s father. Zeifman pleaded that he was joint managing conservator; Michels requested the district court to take judicial notice of the file in their divorce case, which demonstrated Zeifman’s joint managing conservatorship. Both Zeifman and Michels recounted the history of their litigation concerning where A.A. should attend elementary school, including the opinion of this court reversing the district court’s order granting Michels sole control over A.A.’s educational decisions. Michels further alleged that she and Zeifman had each filed additional motions to modify the divorce decree and were currently litigating these issues.
Even if Zeifman demonstrated a justiciable interest in her suit, Michels contends, he has not demonstrated that the district court abused its discretion in striking his intervention. She relies on the proposition that “[i]t is only an abuse of the trial court’s discretion to strike a petition in intervention if the intervenor: (1) could have brought the same action, or any part of it, in its own name; (2) the intervention would not complicate the case by excessively multiplying the issues; and (3) the intervention is almost essential to effectively protect the intervenor’s interest.” Michels derives these principles from the Texas Supreme Court’s decision in
Guaranty Federal. See
Michels misconstrues the
Guaranty Federal
holding in several ways. In that case, the Texas Supreme Court first held that a trial court abused its discretion in striking an intervention sua sponte, as rule 60 presumptively permitted an intervention unless a motion to strike was filed.
Furthermore, under Rule 60, a person or entity has the right to intervene if the intervenor could have brought the same action, or any part thereof, in his own name, or, if the action had been brought against him, he would be able to defeat recovery, or some part thereof. The interest asserted by the intervenor may be legal or equitable. Although the trial court has broad discretion in determining whether an intervention should be stricken, it is an abuse of discretion to strike a plea in intervention if (1) the intervenor meets the above test, (2) the intervention -will not complicate the case by an excessive multiplication of the issues, and (3) the intervention is almost essential to effectively protect the inter-venor’s interest.
Id. (internal citations omitted). The supreme court held that these conditions were met in that case and that, accordingly, the district court had abused its discretion in striking the intervention. Id. at 757-58.
While
Guaranty Federal
does identify a set of equitable conditions under which the striking of an intervention would be an abuse of discretion, it does not, contrary to Michels’s assertion, establish the “only” or exclusive circumstances in which that would be so.
See In re Lumbermens Mutual,
Furthermore, Michels both misstates the first element of the Guaranty Federal framework and misapplies it. This element is not limited to whether the would-be intervenor “could have brought the same action, or any part of it, in its own name,” as Michels states, but also is satis *467 fied “if the action had been brought against him, he would be able to defeat recovery, or some part thereof.” 10 Moreover, the first element of the Guaranty Federal framework is not as restrictive as Michels suggests:
The requirement [for intervention] has been stated, not exhaustively, to demand that “the intervenor’s interest ... be such, that if the original action had never been commenced, and he had first brought it as the sole plaintiff, he would have been entitled to recover in his own name to the extent at least of a part of the relief sought; or if the action had first been brought against him, he would have been able to defeat a recovery, in part at least.” The statement) a useful guide, does not reach all situations. It does not cover, for example, the case in which the intervenor-defendant could not have been sued directly, yet a judgment for plaintiff may lead to an action over against the intervenor or otherwise seriously prejudice the intervenor, and the intervenor’s intervention is necessary to assure proper defense of the claim. Nor does it meet the situation in which the intervenor asserts a claim adverse to both parties, though in special circumstances such an intervention may be proper....
1 Roy W. McDonald & Elaine A. Grafton Carlson, Texas Civil Practice § 5.80, at 967-68 (2d ed.2004) (citations omitted) (emphasis added). Citing this commentary with approval, we held in
McCord
that while a child’s grandparents in that case could not have initiated an original suit affecting the parent-child relationship, they did possess a justiciable interest in their grandchild’s best interests that could support intervention in the divorce and custody suit initiated by the child’s parents.
McCord, 111
S.W.2d at 811-13;
see also Jenkins v. Entergy Corp.,
Michels ultimately relies on the fact that she subsequently non-suited her claims against AISD, suggesting that this tactic extinguished any justiciable interest Zeifman might have possessed in the action at its inception,
see Potash Corp. of Saskatchewan, Inc. v. Mandas,
For these reasons, we hold that the district court abused its discretion in striking Zeifman’s intervention, accordingly sustain Zeifman’s first issue, and reverse the district court’s striking of the intervention. During oral argument, Michels conceded that the district court’s order denying sanctions was necessarily predicated upon its order striking Zeifman’s intervention. Thus, we also reverse the district court’s order denying sanctions and remand for further proceedings.
Regarding sanctions, rule 13 of the Texas Rules of Civil Procedure allows a trial court to impose sanctions against an attorney, a represented party, or both, who file groundless pleadings brought in bad faith or brought for the purpose of harassment. Tex.R. Civ. P. 13. Additionally, chapter 10 of the Civil Practices and Remedies Code allows a trial court to impose sanctions against a person, party, or both for advancing frivolous pleadings or motions. Tex. Civ. Prac. & Rem.Code Ann. §§ 10.001(1), .004(a) (West 2002). In light of our observation that Michels’s conduct as alleged by Zeifman “is indeed disturbing,” the district court on remand should carefully consider the facts known by Mi-chels at the time she filed suit against AISD when determining whether sanctions are appropriate.
See Law Offices of Windle Turley, P.C. v. French,
Notes
.
See Zeifman v. Michels,
. In re Zeifman, No. 03-06-00601-CV, slip op. at 2.
. In re Zeifman, No. 03-07-00075-CV, slip op. at 1.
. In re Zeifman, No. 03-06-601-CV, slip op. at 2. We also observed that ''A.A.’s parents— not the courts or other third parties — are in the best position, perhaps with the assistance of a competent mediator, to make that determination in A.A.'s best interests, thereby avoiding extensive and acrimonious litigation that could adversely impact A.A., their other child, each other, and possibly others.”
.This standing order, applicable to ''every divorce suit and every suit affecting the parent-child relationship filed in Travis County” after January 1, 2005, prohibits parties, "while the lawsuit is pending before the court,” from actions including "[d]isrupting or withdrawing the children from the school or day-care facility where the children are presently enrolled, without the written agreement of both parents or an order of this Court.” See Travis Co. Standing Order Regarding Children, Property and Conduct of the Parties (Travis Co. Dist. Clerk’s File No. 121,012 (Local Rules and Orders)) (effective Jan. 1, 2005). Although the parties’ 1997 divorce decree predated the standing order, Michels alleged that Zeifman had made himself subject to the order by filing a cross- *463 petition in a second modification proceeding she had initiated in 2005 concerning G.L.
. The publicly available State Bar of Texas publications from this course state that it was held between August 14-17, 2006.
. This date corresponds to the day after the 2006 State Bar Advanced Family Law Course was scheduled to end.
.Order on Plea to the Jurisdiction of Sheryl Diane Michels, May 24, 2006. On appeal, Zeifman points out that Michels subsequently made similar arguments in the district court, after she filed a petition for review of this Court’s judgment in the supreme court, in resisting his efforts to enforce his rights under the original divorce decree.
.
Lumbermens Mutual
involved the appellate intervention of an insurer after its insured, for whom it had paid the appeal bond, abandoned potentially dispositive issues impacting claims within the scope of coverage.
See In re Lumbermens Mutual,
. We thus reject Michels's contention that "[a] proper intervention requires that the in-tervenor be seeking some sort of affirmative relief from the court.”
. We find it interesting that Michels would decry Zeifman’s intervention as "complicating” their litigation by "multiplication” of issues where she has done precisely that by foregoing the parties’ ongoing proceedings under the divorce decree and filing a related but separate lawsuit (leading to a separate appeal), ensnaring a third party in her domestic dispute, yet oddly not naming Zeifman as a party in that separate proceeding — who, she acknowledged at oral argument, clearly had a justiciable interest. If intervention is ultimately an equitable concept,
Highlands Ins. Co. v. Lumbermen's Mut. Cas. Co.,
. We note that Zeifman did not obtain a reporter's record below, nor requests findings *469 of fact and conclusions of law. As Michels observes, such devices enable an appellate court to review a trial court’s rulings to award (or not award) sanctions.
