Which character in the novel is used to illustrate the theme that basic personalities never really change in the novel, Timebound?

This theme is primarily demonstrated through Kate’s father, Harry. At the start of the book Harry is shown to be a loving father towards Kate. He’s willing to move into Katherine’s house just so Kate has the opportunity to be with her. When the timeline changes, Harry starts a life with a new family, having absolutely no idea who Kate is, or that she used to be his daughter. When Kate meets with the new Harry he initially wants nothing to do with her. At the end of the book, Kate finds out that he wrote her a letter shortly after their meeting. He promised that he would do anything to take care of her, and still thought of himself as her father.