How to apply for the family membership certificate

Hi, I am the owner of a property which was owned by ulakannan in 1970 and was given the pattayam by the government to him. when he died in 1983 he had three sons and they inherited this property who were legal heirs of the property . and these legal heirs partitioned this property and one son's property was bought by me. Now, when I went to apply for a loan from the bank they asked for the family membership certificate to be presented. and to apply for it when I had went to the village officer , he said that only the family members or the heirs can apply for it. But the heirs are not willing to apply for the certificate . And in this circumstance I applied to the village officer as per the RI act . The village officer told that only the heirs can apply for the family membership certificate. So I gave an appeal to the Tahasildar to direct the village officer in issuing the certificate. my question is:- How can I apply or how can I get the family membership certificate from the village officer to get the loan as I leading a huge crisis now?