Mother deed not available...

What do you mean by the mother deed?

Is it that you do not ahve the registered sale deed on your father's name?

If there is no registered title deed on your father's name then how did he occupy this property and what is the basis of your ownership of the property?

If there is a registered title deed on your father's name is avaliable then you can get the details of the acquisition of the property by the vendor with the details of the documents by which he owned the property,  in that case based on the basis of the details available on the registered title deed in your father's name, you can submit an application to the concerned registrar office to obtain the previous link document.

You can apply for EC from 01.01.1981 to 31.12.1981. If the sale deed was really registered, you may find it by verifying the EC.

Sir, Title deed is there in my fathers name.

The lawyer of the buyer is asking for the mother deed. We tried applying for the same from the sub registrars office, unfortunately none of them are able to trace it. 

If the purchase has been made through a "sale deed" or "registered "GPA" copy of the same is maintained and available with concerned / area Sub-Registrar, inspect its record and obtain duplicate copy as per rules.

However, if the property is purchased on the document of Unregistered "GPA" you may not find any record.

Is it possible that all 30 occupants do not have any record / clue about the document, as stated by you.

However, if none of the document is traceable, you will have to file a suit for declaration and permanent injunction against the vendor and general public.

Noted sir. Thank you all for the inputs and guidance.

The lawyer of the seller is asking for the mother deed. That exactly is the problem. You may live there as long as you want to so long as no one disputes your ownership. But when you want to sell the problem comes. A buyer  will be hesitant to buy your property until  you can convince him about your title to the property.

If at all there had been a mother deed, particulars would be mentioned in the deed registered title deed in your father's name. Any further suggestion depends upon the citations in the latter deed.