77Meaning of child for the purposes of this Part of this Act
(1)" Child " in this Part of this Act means—
(a)for the purpose of sections 69 to 71, a child within the meaning of Part III of this Act,
(b)for the purposes of section 73, a person under sixteen and
(c)for any other purpose, a person under eighteen.
(2)" Parent" in this Part of this Act includes a guardian.