The sheriff said the boy is accused of killing his parents and critically wounding his 11-year-old sister.
He said a brother was also in the home but was not injured.
The victims have been identified as husband and wife, 37-year-old Lue Yang, and 37-year-old Se Vang.
Sheriff Zanoni said the boy's name will not be released at this time because he is a juvenile.
He said the boy called 911 that night saying an intruder committed the crime and left in a pickup but detectives quickly unraveled that story.
The sheriff said the boy used multiple weapons in the killings and attempted murder of his sister.
The investigation is ongoing