This isn't a simple situation that can be answered through a general question and answer forum over the Internet.
You will need to get copies of the Articles of Organization, any Operating Agreement, any documents from the father's probate proceedings, etc. and have an attorney review them and determine the best course of action to take based on the particular circumstances of your situation.
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You will need to confer with an attorney. The question is complex and there is not enough information to provide much guidance. An attorney will review the company formation documents, member control agreements, and estate documents to determine the proper status of the parties and a course of action.