Two teenage sisters viciously stabbed a 21-year-old Long Island man for defending his younger sister against them on Saturday, police and family said.

Bay Shore siblings, Diamond King, 18, and Myia King-Harrison, 19, allegedly got into a violent tussle with the victim outside a Mastic home in Suffolk County around 10:20 p.m., according to authorities.

The victim was defending his younger sister. News12

Suffolk County police said he was taken to Stony Brook University Hospital, where his father told Newsday his son, Nico Cassetana, is in a medically induced coma.

One of the sisters allegedly attacked Cassestana after he attempted to protect his younger sister against the two suspects.

Footage obtained by News 12 shows the young man calling 911 to let first responders know he’d just

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