This story takes place a short while after Coolidge’s son Calvin, Jr had died:

One morning, arriving at the White House, Colonel Starling found a boy pressing his face to the iron fence. “I thought I might see the president,” the boy said. “I heard that he gets up early and takes a walk. I wanted to tell him how sorry I am that his little boy died.” Starling took him in; the boy was so overwhelmed, Starling later recalled, that he could not speak. Starling explained to the president. And that time Coolidge nearly did break down; the president, Starling saw, “had a difficult time controlling his emotions.” Later, when they walked through Lafayette Park, Coolidge told Starling, “Colonel, whenever a boy wants to see me always bring him in. Never turn one away or make him wait.”

Btw, this is an excellent biography.