Well, one of the staples of daytime television for decades, even before DS, has been the discovery of a child born out of wedlock. With the possible exception of Victoria Winters, whose true parentage was never established, and the yet to be born child of Catherine and Bramwell, that never happened on the television show or any of the other series or films that followed. It's difficult for me to believe that Quentin wouldn't have a few heirs scattered about Maine and elsewhere.