Kevin Moses Paul
24 September 2021
As per your concern, let me inform you that an Unregistered Sale Agreement is enforceable in Law, and any shortage of stamp charges can be paid through the Court's order. However, such an agreement will only be valid for a time period of three years from the date of it's execution.
Moreover, in case of a negative clause in the agreement, like if it is mentioned there in the agreement that the buyer has to get the property registered within three months, then in such a case the limitation period is extended by such a period i.e. mentioned time duration.
Now, in your case the major points are that the sale deed was unregistered, it has been more than 3 years, both parties that entered in the deed (your mother and builder) are no longer alive, and the deed was never proceeded with further process the sale deed that your mother formulated with the builder is no longer valid, and hence as per law there are no chances for any member to the builder to claim any sort of his or her right over the flat.
You are the sole owner of the flat after your mother's departure, and thus you have total ownership rights over the same. It's advisable that you engage a local lawyer for execution of another agreement if you're willing to, and consult with him for further process in order to clarify the concept.
Hope It Helps!
Regards,
Kevin M. Paul