Sec. 6. If an affidavit by a competent person that:
(1) sets forth the fact of the death of one (1) joint tenant; and
(2) establishes the identity of the surviving joint tenant, who is named in the certificate of burial rights for a cemetery plot;
is filed with the cemetery in which the plot is located, the affidavit is complete authority to the cemetery to permit the use of the unoccupied portion of the plot in accordance with the direction of the surviving joint tenant or the successor in interest of the surviving joint tenant.