I know you haven't given figures but imagine it's like this
300,000 'supposed' to be shared 3 ways so 100,000 each. Instead you and your sister get 50,000 and your brother gets 200,000
Now imagine you go to court. You lose, which is likely I'm so sorry to say. You owe 40,000.
You now have 10,000, your brother still has 200,000. Your sister still has 50,000 because despite encouraging you to fight, and e levying more if you won, I'm guessing she'll suddenly go shy when it comes to sharing the court costs. M
All that has happened is you are exhausted, still furious and no where near understanding why this happened. Because you can't know, because the people who do know are gone.
I know this feels awful but you WERE left something. Enjoy that, let go xxx