Classmates at Pierce High School in Arbuckle are going to miss the Santiago sisters.
Alyssa and Brenda Santiago, along with their mother, were killed Saturday night by a wrong-way driver on Interstate 505. Investigators identified the wrong-way driver as 36-year-old Francisco Salazar Garcia, of Antioch.
Their step-father was the only survivor, according to the CHP.
"It's been really hard with everybody together," friend Cynthia Dorantes said. "We are a small, small community, small school, all trying to get through this together."
Students and teachers gathered in front of the school Monday morning in prayer.