The victims have been identified as Lue Yang and Se Vang, who were married.
The incident happened around 7:30 pm Wednesday at a home in Miramonte, California, according to the Fresno County Sheriff's Office.
Investigators say the 14-year-old called 911 and said someone broke into their home and attacked his family before leaving in a pickup truck.
When deputies arrived, they found Lue and Se dead, and their 11-year-old daughter badly injured. She was rushed into surgery and is expected to survive.
Deputies at the home found evidence that they say showed the 14-year-old made up the break-in story and that he was the one who used multiple weapons to attack his family.
Another child, a 7-year-old boy, was at the home and was not injured. He is now with other family members.
Authorities are still investigating a motive behind the crimes.
The 14-year-old is facing two charges of murder and one charge of attempted murder.
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