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I am sorry to hear about you loss, and this situation.
A formal conflict of interest that mandates that an attorney opt out from a representation in Louisiana can be found HERE, under 1.7 to 1.10.
The firm becoming limited partners with the construction was not a conflict of interest. An attorney may do business with a client and continue to act as their attorney within that business matter. So this is moot here.
The brother using this firm for probate is also not a conflict of interest. This is because just because the firm used to represent the deceased and the brother does not mean that it cannot represent the brother in an estate matter for the deceased. There is no conflict of interest as this is brother v. you, and not brother v. the estate.
If you wish to try to have them removed, you can file a Motion to Recuse Counsel and try, of course. But chances are slim that they would be.
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