New York, USA : John Kennedy Jnr (4 1/2), son of late U.S. President Kennedy, enjoyed the land of "Make Believe" during yesterday's visit to the World's Fair. Youngester was content to be an infantryman as he marched along with his cousin, Tina Radziwill, daughter of Mrs Kennedy's sister, Princess Lee Radziwill. The children were visiting the belgian village at the Fair, to which they were taken by their maternal grandmother Mrs Hugh Auchincloss. 25 April 1965