(1) An administration claim or a claim under rule 67.4 may be brought by any —
(a) executor or administrator of the relevant estate;
(b) person having or claiming to have a beneficial interest in the estate of a deceased person or under a trust; or
(c) trustee of the relevant trust.
(2) Any executor or administrator of the relevant estate or trustee of the relevant trust who is not a claimant must be a defendant to the claim.
(3) The general rule is that the claimant need not join as a defendant any person having a beneficial interest under the estate or trust.
(4) The claimant may make any such person a defendant and the court may direct that any such person be made a defendant.