(1) When a petition complains of an undue return and claims the seat for some person other than the person returned, it shall be lawful for the respondent, within 10 days after the service of the notice of the petition as aforesaid, to give notice in writing to the petitioner that he or she intends to complain of the election of the person on whose behalf the seat is claimed undue.
(2) The grounds on which a respondent intends to complain of the election of a person on whose behalf the seat is claimed undue shall be set out in the notice and the rules applicable to a petition and the particulars of charges made therein shall apply to every such notice.