When a person's interest in a suit is not represented by existing parties, that person can become a party through a

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A motion to intervene allows a non-party to become a party in a lawsuit when they have an interest in the outcome. This is the most common way for a person to become a party in a suit. A petition to include and cross-claim are not relevant to this situation. A guardian ad litem is appointed to represent the interests of a minor or incapacitated person, and is not applicable here.

When a Person's Interest in a Suit Is Not Represented