From the facts you gave, there is no conflict that would disqualify X's attorney. As to the second part of your inquiry, everyone who appears in court has an obligation to be truthful. If you have evidence that your X lied to the court, alert your attorney and let him handle it.
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No reason that your ex cannot use the attorney. People who work at law firms often use the lawyers in those firms if they have need. If your ex lied on the papers you should tell your attorney who can investigate it. Yes, attorneys must be truthful to the courts.
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