If the QCD was filed in the land records, there is no way this man would've rec'd a loan - or placed any type of lien against the property.
The owners should file a declaratory judgment to remove the lien from chain of title.
A tenancy by the entierty means man and wife, as a unit, own the property. Man, alone, cannot break the tenancy by the entierty. They must execute a deed, together. I think you are confused on what the terms mean, and so the question may be a bit misleading. The surest thing is to bring your documents to a Salisbury attorney for review and explanation. Would you like a referral?
I agree with the other two answers. If he did in fact own the property outright himself and executed one quitclaim deed to his kids reserving a life estate for his wife only, then he has given away every right he has in the property. If he owned it as "tenants by the entirety" then that indicates he owned it with another person so you have a different outcome. This would be a simple, and most likely inexpensive, matter to seek advice on from an attorney. Take a copy of the original deed and the subsequent deed to a local real estate lawyer for a consultation.
Disclaimer: This answer sets up no attorney/client relationship. The information provided here is done so as general information only and is not intended as legal advice.