Section 22(20)(b) in All India Services (Death-Cum-Retirement Benefits) Rules, 1958
(b)"family" in relation to a member of service means-(i)wife in the case of a male Member of service, or husband in the case of a female member of service;(ii)a judicially separated wife or husband, such separation not being granted on the ground of adultery and the person surviving was not held guilty of committing adultery;(iii)unmarried son who has not attained the age of twenty-five years and unmarried or widow or divorced daughter, including such son and daughter adopted legally;(iv)dependent parents;(v)dependent disabled siblings (i.e., brother or sister) of a member of service.