Definition: Compose a new way to ask the same question. The new question must be asking the exact same thing as the original question does. Without any other information, you should be able to tell that the original question and the new question are the same. Preserve bracketed phrases in your new question. You can change the rest of the question provided the above requirements are satisfied. The new question must have a natural, fluent formulation, as if it were composed by a native English speaker. You will be given three pieces of information to help you create better questions. Those are: "Answer": the answer to the question, e.g., "Honolulu". "Answer Type": the type of the answer, e.g., "Location". "Auxiliary Information" is a detailed description of some concepts mentioned in the question, if any.
Input: original question: what Public speaker is involved in a Sibling relation that involves [John F. Kennedy]?
answer: robert f. kennedy
answer type: Public speaker.
auxiliary information: John Fitzgerald Kennedy, commonly known as Jack Kennedy or by his initials JFK, was an American politician who served as the 35th President of the United States from January 1961 until his assassination in November 1963. Notable events that occurred during his presidency included the Bay of Pigs Invasion, the Cuban Missile Crisis, the Nuclear Test Ban Treaty, Police Week, the establishment of the Peace Corps, the Space Race, the building of the Berlin Wall, the African-American Civil Rights Movement, and the increased U.S. involvement in the Vietnam War. After military service as commander of Motor Torpedo Boats PT-109 and PT-59 during World War II in the South Pacific, Kennedy represented Massachusetts's 11th congressional district in the U.S. House of Representatives from 1947 to 1953 as a Democrat. Thereafter, he served in the U.S. Senate from that state from 1953 until 1960. Kennedy defeated Vice President and Republican candidate Richard Nixon in the 1960 U.S. Presidential Election. At age 43, he was the youngest man to have been elected to the office, the second-youngest president. Kennedy was the first person born in the 20th century to serve as president.

[John F. Kennedy] is involved with a sibling relation that is what public speaker?