Can an answer to a divorce petition be changed even after the answer was filed with the court

Yes, you can ammend your answer. If within your answer you included a counterpetition then you can only amend your answer BEFORE the other party has filed his/her answer to that counterpetition. if the counterpetition has already been answered, then you will need to file a "Motion for Leave to Amend Pleading" and explain to the judge in your motion the legal basis for your request to amend that pleading. You would be wise to consult with an attorney concerning your specific facts in order to get a case-specific answer. Good luck!