In section 28B of the Principal Act, for the definition of dependants substitute —
""dependants", in relation to a claimant, means—
(a) any persons who are wholly, mainly or in part dependent on the claimant at the time that the liability in respect of which the claim is made arises; or
(b) any unborn children of the claimant (including unborn children derived by adoption or otherwise) at the time that the liability in respect of which the claim is made arises and who is born after that time;".