premise: Shoki Kasahara (笠原 将生 , Kasahara Shōki ) (born January 9, 1991 in Fukuoka) is a Japanese professional baseball player who last played for the Yomiuri Giants in Japan's Nippon Professional Baseball. His younger brother Taiga is also a professional baseball player currently playing for Fukuoka SoftBank Hawks. His father Eiichi is a former professional baseball player.
hypothesis: Shoki Kasahara's younger sister Taiga is also a professional baseball player. 
reason: Taiga is Shoki Kasahara's younger brother not sister.