Yes it seems a will, or no will, must go to arbitration to your local Family Court for arbitration, its not really a 'horror' story, its pretty much a universal thing, to find if anyone one else is entitled to assets, i.e. money owed to any financial institutions, etc..
The Krungsri bank in reply to an email gave me a list of what my wife must do on my demise. No will.
From memory; Take death cert, passport to the court, wait until you receive the letter from the court, go to bank with the letter, PP, bank book, death cert.