A person is a
"member of the family" of a deceased worker, if the person is—
(a) the worker’s—(i) spouse; or(ii) parent, grandparent or step-parent; or(iii) child, grandchild or stepchild; or(iv) brother, sister, half-brother or half-sister; or
(b) if the worker stands in the place of a parent to another person—the other person; or
(c) if another person stands in the place of a parent to the deceased worker—the other person.