Given the task definition and input, reply with output. 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.

original question: Which tennis tournament champion is the sibling of [Serena Williams]?
answer: venus williams
answer type: Tennis Tournament Champion.
auxiliary information: Serena Jameka Williams is an American professional tennis player who is ranked No. 1 in women's singles tennis. The Women's Tennis Association has ranked her world No. 1 in singles on six separate occasions. She became the world No. 1 for the first time on July 8, 2002, and achieved this ranking for the sixth time on February 18, 2013. Williams has spent 252 weeks overall as the WTA ranked #1 as of August 3, 2015, placing her 4th on the List of WTA number 1 ranked players. She is the reigning champion of the Australian Open, French Open, Wimbledon, U.S. Open, WTA Tour Championships and Olympic women's singles. Williams is regarded by some commentators, sports writers, and current and former players as the greatest female tennis player of all time. Williams holds the most major singles, doubles, and mixed doubles titles combined amongst active players, male or female. Her record of 36 major titles puts her fifth on the all-time list and first of the open era with: 21 in singles, 13 in women's doubles, and two in mixed doubles. She is the most recent player, male or female, to have held all four major singles titles simultaneously, and the fifth woman ever to do so.
Which of [Serena Williams]' siblings is also a tennis tournament champion?