The son of deceased father if not convinced, can doubt it.
If his contentions are not accepted amicably and within the family then he can approach court.
After all 'Court and State' is 'Parens Patriae'; Parent to the nation.
Have you consulted a very able counsel, as already suggested?
If,yes, what is the opinion of your own counsel?
If NO, as already suggested before you proceed on your own show all docs on record to a very able counsel specializing in revenue/property/family/civil matters.
Prefer a registered family agreement. Therafter there shall be NO litigation.