Section 419B.872 - Amendment of pleadings(1) A petition, answer, motion or other paper may be amended by a party within a reasonable time before an adjudication on the petition, answer, motion or other paper. Whenever an amended petition, answer, motion or other paper is filed, it shall be served upon all parties. When the interests of justice require additional time to prepare, due to the amendments to the petition, answer, motion or other paper, the court shall grant such additional time as is reasonable.(2) The court, on motion of an interested party or on its own motion, may at any time direct that the petition be amended. If the amendment results in a substantial departure from the facts originally alleged, the court shall grant such continuance as the interests of justice may require.