Can a mediation agreement be revoked in the state of Texas due to lies?

A court hearing on an estate. A person is adopted away from biological parent and siblings. Biological siblings told lies in a mediation session to

A court hearing on an estate. A person is adopted away from biological parent and siblings. Biological siblings told lies in a mediation session to gain access to the estate. There are other siblings on the adopted side, which by law, makes them the legal heirs.

or:A court hearing on an estate. A person is adopted away from biological parent and siblings. Biological siblings told lies in a mediation session to gain access to the estate. There are other siblings on the adopted side, which by law, makes them the legal heirs.

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