45. The Act of 1964 is amended by the substitution of the following section for section 3:

“3. (1) Where, in any proceedings before any court, the—

(a) guardianship, custody or upbringing of, or access to, a child, or

(b) administration of any property belonging to or held on trust for a child or the application of the income thereof,

is in question, the court, in deciding that question, shall regard the best interests of the child as the paramount consideration.

(2) In proceedings to which subsection (1) applies, the court shall determine the best interests of the child concerned in accordance with Part V.”.