(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.