(CNN) -- Caroline Wozniacki doesn't like losing -- and it's a trait that the tennis star's nearest and dearest also possess. Born into a sports-mad family, the Danish star had to battle for supremacy within the competitive environment of her childhood home in Odense, long before she had designs of making tennis her career. Both her father Piotr and older brother Patrik were professional footballers. Mother Anna played volleyball for Poland, where both parents were born -- and lived until Piotr joined a Danish club. "Sport was in my genes," Wozniacki told CNN's Open Court program. "But nobody would play me because they said I wasn't good enough -- they always put me in the umpire's chair!Caroline Wozniacki tells CNN that family rivalry spurred her on to become world number oneWozniacki was made to umpire matches because she was not good enough to beat her familyThe Dane recalls meeting Venus Williams as a 12-year-old and the effect it had on her careerWozniacki and her golfer boyfriend Rory McIlroy are keen users of networking site Twitter
I have fun with it and give _ a hard time on it!.