Sir, please see the definition of "family" under section 2(11) of ESI Act, 1948 which is as follows:
6[(11) “ family ” means all or any of the following relatives of an insured person, namely : —
(i) a spouse ;
(ii) a minor legitimate or adopted child dependent upon the insured person ;
(iii) a child who is wholly dependent on the earnings of the insured person and who is —
(a) receiving education, till he or she attains the age of twenty-one years,
(b) an unmarried daughter ;
(iv) a child who is infirm by reason of any physical or mental abnormality or injury and is wholly depen¬dent on the earnings of the insured person, so long as the infirmity continues ;
1[(v) dependant parents, whose income from all sources does not exceed such income as may be prescribed by the Central Government ;
(vi) in case the insured person is unmarried and his or her parents are not alive, a minor brother or sister wholly dependant upon the earnings of the insured person ;]]