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I noticed no one had picked up on this yet, despite it being two hours, and that's likely because it is really two separate questions, one for a legal expert in the area of probate and a second question requiring someone who does accounting. I can likely assist with the probate question, although I would need you to rephrase since I'm not sure what you're asking for when you say you need a "line of succession" but you would need to open new question for the cost basis and direct it to an expert in the accounting, as opposed to Legal, area.
If you want me to continue to assist please let me know and rephrase the line of succession question and also let me know that you are willing to remove the cost basis question from this thread.
If you prefer for me to opt out and open the matter back up I can do that as well, just let me know.