A 13-year-old boy stabbed his 14-year-old sister multiple times with a steak knife because she was “bothering him,” police said Sunday.

The girl suffered wounds to her back, legs, thighs, arms and face in the knifing around 7 p.m. at the family’s 111th Avenue and 156th Street home in Jamaica, cops said.

The girl, who was in critical but stable condition, told cops her brother stabbed her. The brother said his sister was “bothering him,” cops said.

There was also an 8-year-old boy in the house.

The girl was being treated at Jamaica Hospital.

The boy was in custody, cops said.