Based on the latest R.T.C obtained by you which is showing the name of X's father, obtain the E.C as well for the previous years in respect of the survey number shown in the R.T.C. After this obtain the title deeds pertaining to this survey number which stands in the name of X's father and his predecessors as the case might be from the E.C that you have obtained. These become the mother deeds for the said survey number. Your plot is carved out of this same survey number or any other you will get this information from the sale deed executed by X in favour of your father 28 years back. If the survey number is different, then obtain the R.T.C for that particular survey number and E.C for the previous years as stated above, then obtain the certified true copies of the title or mother deeds based on the E.C for that particular survey number.
You can only produce the certified true copies of the title deeds in respect of the said survey number as the parties/owners are no longer traceable. These documents the bank will accept.
Any other information or assistance you need, you may have to contact a local advocate to take it forward, as this process might be a little complicated.