I don't want your book. I don't want anything from you. I want to make copies of the book your father wrote, and sell them just like you're doing. I'll buy one copy from you to get the text. Then the book will be mine, and I can do with it what I want. I don't have to seek out Shakespeare's or Dickens' heirs just to publish a volume of theirs. What gives you rights they don't have?
The point is, ideas aren't property. We let people monopolize the profit from their ideas for a limited period in order to reward and encourage creativity. But you ain't writing new books, you're just trying to make a profit off your Dad's. I can't see how that encourages creativity. Rather, maybe you'd go out and do something more creative if you didn't have the meal ticket.