I think you're going to need to look at your state law for a final answer. In 1992, Tennessee enacted the Uniform Transfers to Minors Act ("UTMA"), T.C.A. ยงยง 35-7-201.
But off the top of my head, I would question whether this loan can be made. UTMA does not establish a separate legal entity, like a trust does. The purpose of UTMA is to provide a responsible adult custodian to hold property that belongs to a minor until the minor comes of age.
I would question whether the custodian has the right to offer the property as collateral for a loan, since it doesn't belong to them. The property does belong to the minor, but they aren't able to enter into a contract and I don't believe the custodian has the ability to bind them personally.
Your title insurance company may also be able to help you. At the least, they can tell you how the underlying property is current and/or can be vested.
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Still wondering what I've gotten myself into...