Your brother is not your boss and cannot make any such demand of you - it is clearly a breach of fiduciary duty no matter how much of the stock he owns.
What do you mean by saying you resigned? Did you just refuse to work for your brother or did you give him your stock. If you just walked away from working then you still have full ownership of the stock and have full recourse against him.
However, if you gave back the stock then you need to look at the agreement to see what you waived. Regardless, the Statute(s) of Limitations have run. If it has, then you have no recourse.
Did your attorney get well into litigation? That is a VERY big bill if he did not and you certainly have recourse against him just for that. First thing I recommend is to tell him to justify every item on his bill. You should be entitled to that. Then you can ask him to justify everything. He will be very mad but you should be entitled to it. He may offer to waive a part of his fees and you can negotiate that. Don't give very much if did not much.
You can also contact your state bar
association to see if there is rule about overcharging. They may be able to get your bill back to reasonable.
The last thing is to contact a different attorney and see if malpractice was committed. If so, your new attorney may be able to settle easily with the bad guy's insurance company. If there was incompetence the state ar may be able to bring charges and get you full restitution.
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