(1) The High Court and the court may also exercise their functions under this Part (in so far as they cannot otherwise do so) in relation to an adult if subsection (2) or (3) applies in relation to him or her.

(2) This subsection applies in relation to an adult if -

(a) he or she is an Irish citizen, and

(b) Article 7 of the Convention has, in relation to the matter concerned, been complied with.

(3) This subsection applies in relation to an adult if the High Court or the court, as the case may be, having consulted such person as it considers appropriate, agrees to or makes a request under Article 8 of the Convention in relation to the adult.