Legal Question in Wills and Trusts in India

it is advisable as it determines the right and shares of all the parties interested. the government authorities also ask for succession/probate.

it is not necessary unless required by authorities or dispute between the parties. if all the parties gives no objection than you can act on the will.

It is not mandatory required. Nor does the probate determines the rights or shares. probate is declaration of the valid execution of the WILL