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S _ N Clue
I DO NOT HAVE ANY DAUGHTERS AND THE TRUE STATEMENT IS: I HAVE LESS THAN TEN DAUGHTERS. IF I HAVE ANY DAUGHTERS, THERE WILL ALWAYS BE TWO STATEMENTS WHICH ARE TRUE. THEREFORE, I HAVE NO DAUGHTERS D IS EITHER THE NEPHEW OR NIECE OF A. A IS THE UNCLE OF D. D IS EITHER THE SON OR DAUGHTER OF C. A, B AND C ARE SIBLINGS AND A IS A MALE. C'S SON OR DAUGHTER HAS TO BE THE NEPHEW OR NIECE OF D B IS THE SISTER-IN-LAW OF E. A IS FATHER OF C AND C IS SISTER OF D. SO, A IS FATHER OF D. BUT D IS SON OF B. SO, B IS THE MOTHER OF D AND WIFE OF A. ALSO, E IS THE BROTHER OF A. SO, B IS THE SISTER-IN-LAW OF E CHARLIE IS FEMALE AND IS OF THE OPPOSITE GENDER. IF JORDAN IS SAM'S ONLY DAUGHTER, THEN JORDAN CANNOT HAVE A SISTER AND STATEMENT 2 BECOMES FALSE. THEREFORE, JORDAN MUST BE SAM'S BROTHER AND A MALE. FROM STATEMENT 1, CHARLIE'S ONLY SON CANNOT BE SAM AS JORDAN IS SAM'S BROTHER, SO CHARLIE'S ONLY SON IS ALEX. FOR STATEMENT 2, WE KNOW THAT ALEX IS A MALE, SO ALEX CANNOT BE JORDAN'S SISTER. THEREFORE CHARLIE IS JORDAN'S SISTER. IT'S CLEAR THAT SAM, JORDAN AND CHARLIE ARE SIBLINGS AND ALEX MUST BE CHARLIE'S ONLY SON