re: Neurologist said he is considering filing with a judge to remove my FIL from his finances

quote:

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tried googling, but I couldn’t find any evidence that a doctor could go to a judge to remove a person’s ability to do their own finances. 

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TL;DR, he can't. Not by himself. Doctors have a bad habit of thinking they know everything, and they don't. Assuming you're in Louisiana, it's very difficult for even a family member to interdict an adult.