Pretty Boy's son was Charles Dempsey Floyd.Charles for his father and great-grandfather and Dempsey for Jack Dempsey, the boxer.Although he was more often refered to as Jack. He was born 29 Dec 1924 and died 23 Mar 1999 in Vacaville, CA
Story goes that Pretty Boy wanted to name him Jack Dempsey Floyd after the fighter, but his mother Ruby would not have that, so they compromised and Charles Dempsey Floyd was the official recorded name.
John Henry Walkup, they was two of them, one is now deceased, the other still living. The living one I know very well, the other I knew of very well, I never met him, but I know his son.