(1) An application by the opposite party, under the proviso to subsection (5) of section 5, to implead any other child or relative of the applicant shall be filed on the first date of hearing as specified in the notice issued under sub-rule (2) of rule 6:
Provided that no such application shall be entertained after such first hearing, unless the opposite party shows sufficient cause for filing it at a later stage.
(2) On receipt of an application under sub-rule (1), the Tribunal shall, if it is prima facie satisfied, after hearing the parties, about the reasonableness of such application, issue notice to such other child or relative to show cause why they should not be impleaded as a party, and shall after giving them an opportunity of being heard, pass an order regarding their impleadment or otherwise.
(3) In case the Tribunal passes an order of impleadment under sub-rule (2), it shall cause a notice to be issued to such impleaded party in From “C” in accordance with rule 6.