Section 21(4)(a) in All India Services (Death-Cum-Retirement Benefits) Rules, 1958
(a)in respect of any specified nominee that in the event of his predeceasing the member of the Service, the right conferred upon that nominee shall pass to such other person as may be specified in the nomination; provided that if at the time of making the nomination, the member of the Service has a family consisting of more than one member, the person to be specified shall not be a person other than a member of his family; and