If a real estate property has been properly assigned via Quitclaim Deed to any other person, that property is no longer an asset of the person who gave it away.
A property that is not owned by a person (or his/her estate) cannot be gifted via a Last Will and Testament to anyone. So no claims can be made by the heirs of that person, because a person cannot give away property he or she does not own.
The key factor: ensuring that the Quitclaim Deed is/was properly and legally executed to transfer ownership prior to the execution of the Will.