We had "the niece that fleeces" and filed an SAR.
Beyond that, I too would like some guidance on any additional steps we could take to stop the fleecing of the incapacitated uncle which is still going on. The niece is a signer on the account. Disclosure of confidential information has its liability risks or so we were informed by counsel when we inquired about filing a police report. Seems like local law enforcement could be notified. Filing the SAR hasn't resulted in any actual cessation of the regular "vacuuming" of the account by this niece.
Thanks for asking the question, bcompliance. I'll be looking in as well.
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"The further a society drifts from truth, the more it will hate those who speak it."
--George Orwell