Sorai was born the second son of a samurai ( a warrior ) who served as the personal physician of Tokugawa Tsunayoshi ( å 3\/4 å ç å ) . Tsunayoshi would become the fifth shogun . Sorai was born the second son of a samurai who served as the personal physician of Tokugawa Tsunayoshi ( å 3\/4 å ç å ) , who would become the fifth shogun .