Calvin Coolidge, Jr.
Calvin Coolidge, Jr, was born in Northampton, Hampshire County, Massachusetts, on April 13, 1908 and was the younger of the two children of Calvin Coolidge (1872–1933), the 30th President of the United States (1923–1929) and Grace Anna Goodhue Coolidge (1879–1957), First Lady of the United States from 1923 to 1929. His father became President of the United States upon the death of President Warren G. Harding in 1923, when Calvin Jr. was fifteen years old.
On the afternoon on June 30, 1924, he played a game of tennis with his brother John Coolidge. Because he wore tennis shoes without socks, Calvin Jr. developed a blister on his right foot, which progressed into blood poisoning and was the cause of his death on July 7, 1924, less than three months after his sixteenth birthday.  His brother John described the loss of his brother as producing a depression in President Coolidge that lasted the rest of his life.
- "President's son, Calvin Jr., 16 dies". New York Times. July 8, 1924. Retrieved 2010-06-26.
- Calvin Coolidge, Jr. at Find A Grave
- Martin, Douglas (June 4, 2000). "John Coolidge, Guardian of President's Legacy. Dies at 93". New York Times. Retrieved February 18, 2013. "'Though father was tenderhearted, he rarely showed his feelings. But when they were taking my brother's casket from the White House after the services, my father broke down and wept momentarily. Calvin was my father's favorite. It hurt him terribly. It hurt us all.'"
- Coolidge, Calvin (1929). The Autobiography of Calvin Coolidge. Cosmopolitan Book Corp. ISBN 0-944951-03-1.
- Feldman, Ruth Tenzer. Calvin Coolidge Presidential leaders; Publisher: Twenty-First Century Books, 2006 ISBN 0822514966.