(1) A petition for adoption may be filed at any time if:
(a) One of the petitioners is a relative of the child by blood or by adoption, excluding parents whose parental rights have been terminated and persons whose relationship to the child is derived through such parents.
(b) The petitioner is the child’s stepparent.
(c) The petition is accompanied by a written approval of the guardian.
(d) The petitioner is the proposed adoptive parent with whom the child has been placed under s. 48.839.
(2) Except as provided under sub. (1), no petition for adoption may be filed unless the child has been in the home of the petitioners for 6 months or more.
(3) No petition for adoption may be filed unless the petitioners have complied with all applicable provisions of this chapter relating to adoptive placements.