An amended petition is a revised petition filed to correct, update, or expand the relief requested in an Arizona family law case. Amendments may be necessary when new facts come to light, when the original petition contained errors, when circumstances change during the pendency of the case, or when additional issues need to be brought before the court.

In Arizona an amended petition may be filed as a matter of right within a certain period after the original filing. After that period amendment requires either written consent of the other party or leave of court. The court generally allows amendment when there is a good reason and the amendment will not cause unfair prejudice.

When an amended petition is filed the other party typically has a new opportunity to respond to the amended allegations. The amended petition should be clearly marked as amended and should either track or supersede the original depending on whether the amendments are additions or replacements.