Correct the Defect; Buy Title Insurance . . . . or take the least expensive way out and simply wait until 40 years have gone by without a challenge to your Ownership.
The definition of Marketable Title is State/Commonwealth specific and is established/defined by Statute . . . . so answers may vary considerably by Jurisdiction.
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Dale C. Hittle of GOLDEN RULE PROPERTIES in Glover, Vermont
Where We're Always Striving To Put Together "THE FAIR DEAL"