Bobby Kennedy played football for Harvard in 1945, 1946 and 1947 Harvard Programs. His picture can be seen in Harvard program from this period, making them more collectable and valuable than other programs of that era.

From the Harvard-Dartmouth 1947 program:

1963 Stanford-California Football Program also has special significance. The game was scheduled to be played November 23, 1963, but was postponed a week to the assassination of John F. Kennedy the day before.

Ted (Edward) Kennedy played for Harvard on the 1955 team, seen here from a Harvard-Princeton Program of the same year:

Although the Kennedy's are famously Harvard men, John Kennedy did go to Princeton for a brief time and was accepted into the class of 1939. He is therefore pictured in Princeton's yearbook Bric-A-Brac for the years 1937-1940. Even though he only attended for a year apparently the school used the freshman year picture of the class for all four years. The image is seen below.

Kennedy is the very young looking man in the center of the image wearing a light double-breasted jacket.