Police say a 15-year-old girl bit off part of her mother's nose and pushed her grandfather down the stairs on Christmas Eve as they attempted to keep her from grabbing a knife. 

The report says 37-year-old Annalilia Caballero had part of her nose severed and 60-year-old Roberto Caballero suffered head injuries.  Both were taken to Rhode Island Hospital.

The girl also punched and kicked the 2 responding police officers.  The Providence Journal reports that the girl's family said she has a history of violent outbursts.

[Providence Journal]