(a) Once a grandparent has been granted visitation rights, the grandparent shall be given proper notice of any petition or order providing for a change in custody or visitation rights, and the grandparent shall have standing to intervene and be heard in any hearing affecting the grandparent's visitation rights.
(b) Any order granting, modifying or denying parent visitation rights shall not affect visitation rights granted to a grandparent pursuant to this chapter, absent a specific finding pursuant to section 608 of this chapter.
(c) If the child is actually residing with a grandparent in a stable relationship, whether the court has awarded custody or visitation to the grandparent or not, the court may recognize the grandparent as having the same standing as a parent for evaluating what custody arrangements are in the best interest of the child.