Bethany's elderly father gave her written authority to sell the family house. Her father lived in Arizona, and she lived in Minnesota. After about two months she found a buyer for the house and signed an acceptance of the offer on March $21.$ Later that same day, she learned her father had died the day before $($March $20).$ Other members of the family did not want the family house sold and claimed that the acceptance Bethany signed was void. The buyer of the house claims Bethany had the legal authority to sell the house and that the contract is binding. Who is right?