This is a difficult situation. There are too many risks here for your bank to allow Dad to negotiate the checks to you, unless he is first appointed an administrator of the estate. Without that appointment, he has no standing to indorse the checks, even to himself.
You can't be certain that Dad is the only person with an interest in the funds. If there are claims against the daughter's estate, you could be caught in the middle of a court case, since the tax refunds are estate assets.
I recommend you suggest that Dad take the checks to the Probate Court and ask for guidance there.
The small accounts statute won't help you because there's no account involved yet.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8