The Years of Lyndon Johnson: The Path to Power by Robert A. Caro
The caption for the photo to the left (third in a series) is: Johnson at the depot to return to Washington as a Congressman. A poignant scene, given the father-son relationship. He walked alongside his mother, ahead of his father, who could not keep up, and was aboard before his father arrived. Sam started to climb up, Lyndon bent down: father and son kissed.