This act shall take effect January 1, 2002. The substantive rights of all persons that have vested prior to January 1, 2002, shall be determined as provided in former chapters 63, 215, 409, 660, and 731-737 as they existed prior to January 1, 2002. The procedures for the enforcement of substantive rights which have vested prior to January 1, 2002, shall be as provided in this act, except that any Family Administration filed before January 1, 2002, may be completed as a Family Administration.