What the penalty to providing false information to a Court ordered GAL in order to sway the Court or Abuse the judicial system?

The GAL has provided false information to the court twice now in a form of a report. This latest false report is the basis of their recommendations. The GAL claimed there was a list of dates and without giving me the dates demanded I give a response. I responded asking for the dates and for us to all meet to resolve the issue. Instead the GAL filed the court report with false information before providing me with the information to show evidence as it was fact. Nor gave any chance for us to meet. I finally received the list of dates in a letter along with the false report to the Court and date of next hearing. No where in the GAL's report to the Court does it state that I had evidence to contrary, offered to meet to resolve or objected to the false allegations. Now there is a court date. What are the laws in Texas for providing false evidence to the court? Isn't the GAL considered an extension of the court? I know the penal code in section 37.03 talks about this as aggravated perjury and under the Rule 13 of the Texas Rules of Civil Procedure this is also mentioned, but what applies to a GAL? What is the GAL obligation to ensure statements are not perjury?