Succession/legal heir certificate for rec bonds

My mother had invested 40lacs in DEC BONDS without appointing a nominee or having any registered will and now i want to transfer the REC BONDS on the name of my father in BANGALORE, so REC is asking me for a succession certificate or a legal heir certificate or a registered will to transfer the bonds Now after enquiring I found that legal heir certificates aren't issued to civilians any more ; for this I want to know if it is true or no There is no will so a will is out of the question Last option remaining is the SUCCESSION CERTIFICATE - pertaining to this i want to clear my doubts - Want to know exactly what documents are required for applying for a succession certificate as some lawyers are insisting to apply for a family tree for the same and some aren't asking for it. Now as there are 5 legal heirs of my mother , I only want this to be issued on the name of my father and none of the other legal heirs . Next what is the court fees applicable for this ?? Any percentage is to be paid to the court ?? I certainly require clarity on these before appointing anyone to file for the process