(1) A testamentary guardian whose appointment does not, under section 10, take effect on the death of the appointor may at any time apply to the Supreme Court for an order that his or her appointment take effect immediately.
(2) Where an appointment of a testamentary guardian of a child has taken effect under section 10 (a) (i) or subsection (1), a parent of that child may apply to the Supreme Court for an order that the guardianship of the testamentary guardian be suspended until the death of the parent or for such period as is specified in the application.
(3) On an application under this section, the Supreme Court may make or refuse to make the order sought, and may make such other orders as it thinks just.