How can we ensure the smooth transfer of property rights?

Intrinsically, there are two approaches to secure a smooth succession of immovable property in question to the intended beneficiary, your father.

- Roopal Bajaj & Keshav Singhania

My father and grandfather jointly own a flat which has been fully paid for by my father. If my grandfather dies, how can we ensure that his rights to the property is transferred to my father alone and not his other children? My grandfather has already stated this in his will. Is there any other documentation to ensure the property’s smooth transfer after my grandfather’s demise? —Name withheld on request