"dependant"

in relation to a member or a pensioner, means—

(a)any person in respect of whom the member or pensioner is legally liable for maintenance;
(b)any person in respect of whom the member or pensioner is not legally liable for maintenance, if such a person—
(i)was, in the opinion of the Board at the time of the death of the member or pensioner in fact dependent upon such member or pensioner for maintenance;
(ii)is the spouse of the member or pensioner, including a party to a customary union according to indigenous law and custom, or to a union recognised as a marriage under the tenets of any religion; or
(c)a posthumous child of the member or pensioner; and
(d)a person in respect of whom the member or pensioner would have been legally liable for maintenance had that person been a minor;