original question: Which US president was sibling of [Joseph P. Kennedy, Jr.]?
answer: john f. kennedy
answer type: US President.
auxiliary information: Lieutenant Joseph Patrick "Joe" Kennedy, Jr. was a junior officer in the United States Navy, a Naval Aviator, and a land-based patrol bomber pilot during World War II. He was the eldest of nine children born to Joseph P. Kennedy, Sr. and Rose Fitzgerald. He was the elder brother of future U.S. President, John F. Kennedy. Joseph Kennedy had been expected to become president, especially after his father's political exile for supporting the appeasement policy of Neville Chamberlain in the advent of World War II. However, Kennedy was killed in action during the war in a top-secret mission, and the high expectations then fell upon his younger brother John.
What is the name of the US president that was the sibling of [Joseph P. Kennedy, Jr.]?