The younger sister of the troubled teen accused of decapitating his mom’s boyfriend returned to her Staten Island home after school Monday to find her brother drenched in blood — and he chillingly told her, “I did something bad, go to your room,” sources said.

The girl walked into the West Brighton home and followed blood trails to the bathroom, where she found the 45-year-old New York City sanitation worker in the tub with his head removed and a knife still in his head, sources told The Post. 5

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She then called 911.

When police arrived, the bloodied 19-year-old suspect came out with his hands up and was taken into custody. Police then located the victim, who has not yet been identified, inside, sources said. 5

The family has a history of domestic incident reports, accordin

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