Barb and Marv Are an Elderly Husband and Wife with Three

Barb and Marv are an elderly husband and wife with three grown children,each of whom has children.Eight years ago Barb and Marv went to their lawyer and executed wills,with each executing a separate will.The oldest son recently spent a week at his parents house with Barb while Marv was on a fishing trip.The oldest son returned to his home after Marv returned from the trip.The next week,his parents were driving late at night on a rural road and ran into a tree.When the car was found several hours later,they were both dead.Marv's will left everything to Barb,and Barb's will,executed the prior week,left all to her oldest son.Discuss this situation.