Introduction

Texas litigation is not limited to the original plaintiff and defendant. Under the right circumstances, a third party can step into an existing lawsuit and assert their own claims—without asking permission first. This procedural tool is called a plea in intervention, and it is governed by Texas Rule of Civil Procedure 60.

Understanding intervention is critical in disputes involving property rights, creditor claims, family law disputes, and business litigation, where outside parties often claim an interest in the outcome.

What Is a Plea in Intervention?

A plea in intervention allows a non-party to join a lawsuit by asserting a claim related to the subject matter of the case.

The governing rule provides:

“Any party may intervene by filing a pleading… subject to being stricken out by the court for sufficient cause on the motion of any party.”
— Tex. R. Civ. P. 60

Unlike many jurisdictions, Texas does not require prior court approval to intervene. The intervenor simply files a pleading and becomes a party—unless someone successfully moves to strike it.

Key Requirements for Intervention in Texas

Although Rule 60 is permissive, courts impose limits through case law. To properly intervene, the intervenor must show:

1. A Justiciable Interest

The intervenor must have a direct, legally protectable interest in the subject matter of the lawsuit.

• Not merely hypothetical or contingent
• Not purely economic unless tied to a legal right
• Must be capable of adjudication in the same proceeding

2. No Excessive Complication of the Case

Courts consider whether the intervention would:

• Complicate the issues
• Delay the proceedings
• Prejudice existing parties

3. Ability to Be Litigated Without Multiplying the Case

Texas courts prefer intervention when it avoids multiple lawsuits over the same subject matter.

Procedural Mechanics of Intervention

Step 1: File the Plea in Intervention

The intervenor files a pleading that:

• Identifies the parties
• States the basis for intervention
• Asserts claims or defenses

No motion for leave is required.

Step 2: Other Parties May Move to Strike

Any party can challenge the intervention by filing a motion to strike.

The burden is on the party opposing intervention to show:

• The intervenor lacks a justiciable interest, or
• The intervention would unduly complicate the case

If no motion to strike is filed—or if it is denied—the intervenor remains in the case.

Common Use Cases in Texas Practice

1. Creditor and Collection Disputes

• A third-party creditor intervenes to claim assets
• Competing lienholders assert priority

2. Real Estate and Property Litigation

• Heirs intervene in title disputes
• Co-owners assert ownership interests

3. Family Law Cases

• Grandparents intervene for custody or access
• Third parties assert conservatorship rights

4. Business and Partnership Disputes

• Members or shareholders intervene in internal disputes
• Alleged owners assert equity interests

Strategic Considerations for Lawyers

For the Intervenor

• Move quickly—delay can undermine your position
• Clearly establish a direct legal interest
• Avoid expanding the case unnecessarily

For Existing Parties (Opposing Intervention)

• File a motion to strike early
• Argue lack of justiciable interest
• Emphasize procedural prejudice or delay

Important Case Law Principles

Texas courts have clarified that:

• Intervention is liberally allowed, but not automatic
• A trial court has discretion to strike intervention
• The key inquiry is whether the intervenor’s interest is “justiciable”

Failure to challenge an intervention can result in the intervenor becoming a full party with rights to discovery, trial participation, and appeal.

Interaction with Other Texas Rules

A plea in intervention often overlaps with:

• TRCP 39 (Joinder of Necessary Parties) – when parties must be joined
• TRCP 97 (Counterclaims and Crossclaims) – once intervention occurs
• Texas Civil Practice & Remedies Code § 37 (Declaratory Judgments Act) – where intervenors often seek declarations

Risks and Pitfalls

1. Improper Intervention Can Be Stricken

If the intervenor lacks a sufficient interest, the court may remove them entirely.

2. Waiver by Silence

If no one moves to strike, even a weak intervention may remain in the case.

3. Expanded Discovery and Costs

An intervenor becomes a full party, increasing:

• Discovery scope
• Litigation costs
• Strategic complexity

Conclusion

The plea in intervention under Texas Rule of Civil Procedure 60 is a powerful and uniquely accessible procedural tool. It allows third parties with a legitimate stake in a dispute to assert their rights without filing a separate lawsuit.

But with that power comes risk—both for intervenors and existing parties. Whether you are asserting an interest or trying to keep a case streamlined, understanding intervention is essential to controlling litigation in Texas courts.

At David C. Barsalou, Attorney at Law, PLLC, we help clients navigate business, family, tax, estate planning, and real estate matters ranging from document drafting to litigation with clarity and confidence. If you’d like guidance on your situation, schedule a consultation today. Call us at (713) 397-4678, email barsalou.law@gmail.com, or reach us through our Contact Page. We’re here to help you take the next step.