If two people are married and they orally agree that in the event of the other's death, they would not make a claim on the deceased spouse's estate. The wife passed away and left nothing in her will to her husband. He elected to take against the will and claim's one-half of her estate as provided by law. Mabel's children protest this action. Is Harold entitled to his statutory percentage of the estate? Could this be under a prenuptial agreement even if there is nothing in writing and is witnessed orally by their children?