1)your father can issue legal notice to builder to execute registered sale deed for 2 flats and 2 shops

2) if builder fails to do so your father can file suit for specific performance .to direct builder to execute registered sale deed in his favour

3) suit for specific performance has to be filed within period of 3 years

4)on your father demise you can make application to court to be added as party to suit along with other legal heirs

5)if copy of draft deed has been forwarded to builder it would be proof that there is no delay in your part

6) for registration of document both parties have to attend court and submit document for registration

Your deed may be put up for registration but unless the sale deed is registered the title would not pass to you. What you have been told by the deed writer is a lame excuse designed to delay the conveyance of the title. The remedy for you is to issue a lawyer's notice to the builder to ask him to register the sale deed in your favour forthwith, and if he does not honour his liability even after the receipt of the notice from your lawyer then sue him in the consumer forum for registration of the property and delivery of possession with compensation for delay as the act of the builder falls squarely within the definition of ''deficiency in service''.

The contents of the agreement is to be seen for giving a proper opinion to that.

An unregistered agreement is not valid i the eyes of law and cannot be enforced.

Your father should issue a legal notice to the builder immediately demanding his money with interest or the agreed property to be registered in his name s agreed upon b the builder.

Discuss with a local advocate on the issues involved in this properly by producing all relevant documents before him and decide next course of legal action on this at the earliest.