Hi,
1.you have to prepare the registered will whereby declaring and stating all the terms of the settlement and partition between surviving legal heirs. It will be pertinent to define and mention the details of the share for the verification and nishandehi purposes so to avoid any kind of collusion or controversy between the surviving legal heirs.
2. The will shall be registered at the place of ordinary residence of your father and should be registered according to registration act being in force.
3. If registered in foreign country it is mandatory to get it properly attested in india too.
For further feel free to contact me..
Rgds