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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 JEFF KILLED MIKE. JACK IS NOT THE MURDERER, BECAUSE HE IS THE BROTHER OF THE MURDERER. DAN CAN'T BE THE MURDERER SINCE HE RAN A MARATHON, AND THE MURDERER RECENTLY HAD HIS LEG AMPUTATED, AND WOULDN'T BE RUNNING A MARATHON OF ANY MAGNITUDE THAT QUICKLY. BEN IS NOT THE MURDERER IF HE JUST MET JACK, SINCE JACK AND THE MURDERER GREW UP TOGETHER. THIS LEAVES JEFF AND MIKE. SINCE JEFF IS STILL ALIVE (HE WANTS TO INSTALL A NEW COMPUTER NEXT WEEK) HE MUST BE THE MURDERER. MIKE ALSO DIDN'T GROW UP WITH JACK. IT HAS BEEN DETERMINED THAT JACK, DAN AND JEFF ARE ALL ALIVE. BEN MUST ALSO BE ALIVE SINCE JEFF PLANS TO INSTALL BEN'S COMPUTER NEXT WEEK. THIS MEANS THAT JEFF KILLED MIKE 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 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