(a) As used in this article:
(i) "Caregiver" means a person, other than a natural parent or legal guardian, who is at least eighteen (18) years of age and is the primary physical custodian and a relative of a minor child;
(ii) "Child" means a person under eighteen (18) years of age who is in the primary physical custody of a caregiver;
(iii) "Relative" or "related" means the relationship of parent, stepparent, grandparent, great-grandparent, sibling, stepsibling, half sibling, uncle or aunt.