From doing account administration programs in both states, I can say the laws of Texas and Tennessee are dramatically different in regard to survivorship provisions on joint accounts...this is a question for a state forum.
As to providing information to the personal representative of the decedent's estate, you can generally provide the information you would have provided to the original owner on the date of his death:
* balance amount,
* accrued interest amount, and
* a copy of the contract containing any survivorship provisions.
Talk to your attorney first.
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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.