I would have offered the same conclusion, but it would have turned on the multiple party account statute's definition of "person" and an overall reading of the statute. There is nothing there that suggests the word "person" is intended to incorporate anything other than a human being.
In some rule sets; e.g. BSA, a "person" can be a legal entity; e.g. a corporation. This one makes no such allowance.
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.