Provide an option that will allow automatic unreserving
...unless you are the closest living relative or obtain permission from the nearest (that is the policy):
I believe the policy stipulates that the person has to be deceased and 110 years from BIRTH, not death (unless you're one of the closest living relatives).
Unless you are the closest relative of the person or have gone through all the strict requirements for getting a reservation approved, it is impossible to reserve someone less than 110 years old. Where are you seeing an issue that some type of automatic unreserve process is needed?