Our expert says:
Insane, of course, is a lay person's term, not used by a psychiarist. Depending on what she self-medicates with, most of the usual culprits would indeed damage her mental state and coudl make her confused and less than competent. In the complex and unpleasant situation you describe, it may be worth consulting a good lawyer, who could apply to a Court for a Competency Hearing to assess her ability to cae for herself, and to manage her afgfairs, and could appoint someone, maybe yourselfor a bank manager, as her guardian in such matters. Within such hearing your concerns about your brother's motivation. It sounds very odd for his EX-wife to be involved in this matter at all --- how ex is she ? Anyhow, the legal route could enable a more dispassionate and neutral assessment and decision, with less resultant suspicion that anyone is acting for their own benefit and not hers.
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