Each in their own way, they were enthralled by the many Houdini artifacts displayed elegantly in the Séance Room and the mysteries behind the man himself.
There is actually another Houdini-Kennedy family connection. In 1923 Joseph Kennedy, father of the Kennedy clan, joined the board of directors of the Film Booking Office of America (FBO). That same year FBO distributed Houdini's final film, Haldane of the Secret Service. Kennedy later took full control of the studio and helped arrange the merger of FBO with RCA and Keith-Albee-Orpheum (Houdini's old vaudeville circuit) to form RKO Studios (Radio-Keith-Orpheum).
I've long hoped to turn up some correspondence between Houdini and Kennedy, or even a mention by Kennedy of the Houdini film. Of course, Houdini believed he had been cheated by FBO, so maybe he had something to say about that at the seance?