50.— (1) A relevant adoption shall not be declared invalid by a court if, after hearing any persons who the court considers ought to be heard, it is satisfied that—

(a) the declaration would not be in the best interests of the child concerned, and

(b) it would be proper not to make the declaration, having regard to those interests and to the rights under the Constitution of all persons concerned.

(2) A relevant adoption, unless declared invalid by a court, shall be deemed for all purposes to be, and at all times since its making to have been valid.

(3) For the purposes of this section, “relevant adoption” means an adoption order, an intercountry adoption effected outside the State or an entry in the register of intercountry adoptions that relates to an intercountry adoption.