Among four boys - Prashant, Vineet, Tarun and Kiran - the following comparisons of height and weight are made. The shorter of Tarun and Kiran is the heaviest of all four. The lighter of Prashant and Vineet is the tallest of all four. The shorter of Vineet and Tarun is the heavier of the two. The taller of Prashant and Kiran is the lightest of all the four. Tarun is not lighter than Vineet and not heavier than Kiran. No two boys are equal in either height or weight. Can you determine the shortest boy and the lightest boy among the four boys?