The Staten Island teen accused of beheading his mom’s boyfriend allegedly showed his little sister the mutilated body — then asked if she wanted their mother to live. “She said, ‘Are you gonna hurt mom?’ ” the suspect’s weeping mother, Alicia Zayas, said of her 16-year-old daughter Bri’s encounter with her blood-soaked son, Damien Hurstel, in the Monday horror.

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