NEW YORK –  When relatives of a Chinese immigrant mother of four young children banged on the family’s door, it opened to a grisly sight: a man dripping with human blood.

Police say 25-year-old Mingdong Chen faces five counts of murder in the stabbing deaths of his cousin’s wife and her children in Brooklyn’s Sunset Park neighborhood on Saturday.

Police say two girls, 9-year-old Linda Zhuo and 7-year-old Amy Zhuo, were pronounced dead at the scene, along with the youngest child, 18-month-old William Zhuo — all found in a back bedroom. Their brother, 5-year-old Kevin Zhuo, and 37-year-old mother, Qiao Zhen Li, were fatally wounded in the kitchen and taken to hospitals, where they also were pronounced dead.

Police say Chen had been staying at the home for the past week or so.