Final answer:
The grantor's warranty is in place to protect the grantee if the grantor does not have the legal right to the property, potentially allowing the grantee to recover the full purchase price in damages.
Step-by-step explanation:
The purpose of the grantor's warranty in the scenario described is to ensure that the grantee is protected in case the grantor does not own the property. This warranty acts as a guarantee that the grantor indeed has the right to convey title to the property and that there are no other claims or encumbrances on the property that would impair the grantee's ownership. If this covenant is breached, meaning the grantor did not have the legal right to sell the property, the grantee can recover damages up to the full purchase price.