Can a Probate Judge remove me as Executor of the Estate just because my brother will not sign he is happy with his part?

I am the executor of the estate of my dad's estate. The Will says to split everything in half. He wants more than half and has taken control over what he wants (three-fourths of the estate). He refuses to sign a paper stating what his half is and he tells the Probate Judge he is not as well. Now, the Probate Judge wants to remove me as Executor of the Estate and assign it to a court appointed attorney and I have to pay 5% of the value of the estate in attorney's fees. Is this legal what the Probate Judge wants to do? Why? What can I do if it is illegal? I can not afford an Attorney because I have already spent $12,000 in attorney fees and the attorney has given up because he says he cant get anywhere with the Probate Judge. I don't know what else is to do. HELP!!!