The Family Proceedings Rules 1991

Applications relating to children of the family

2.40—(1) Where a cause is pending, an application by a party to the cause or by any other person for an order under any provision of Part I or Part II of the Act of 1989 in relation to a child of the family shall be made in the cause; and where the applicant is not a party and has obtained such leave as is required under the Act of 1989 to make the application, no leave to intervene in the cause shall be necessary.

(2) If, while a cause is pending, proceedings relating to any child of the family are begun in any other court, a concise statement of the nature of the proceedings shall forthwith be filed by the person beginning the proceedings or, if he is not a party to the cause, by the petitioner.