The Thottapilly family from Santa Clarita had been missing since April 6.
The bodies of his father and 9-year-old sister were found inside the submerged vehicle on Sunday and his mother's body was found last Friday.
An autopsy is expected to be performed this week as part of the investigation into the incident.
Crews searching for a family whose vehicle plunged into a rain-swollen Northern California river more than a week ago have found the sport utility vehicle and the bodies of a man and a girl inside, authorities said yesterday.
Siddhant Thottapilly, 12, remains missing.
Around 70 searchers had been looking for the missing Thottapilly family near the Eel River in Leggett, California.
Searchers have found the body of a 12-year-old boy, the last missing member of an Indian family of four which perished when their sports utility vehicle plunged into a swollen river in the U.S. state of California some 11 days ago. The Mendocino County Sheriff's Office identified the body of the adult female that was recovered earlier from the river as being that of Sandeep's wife, Soumya.
An inter-agency search and rescue team has recovered two more bodies of an Indian American family who were feared drowned in a California river some 10 days ago, U.S. officials said on Tuesday.
File - This photo released April 12, 2018, by The Mendocino County Sheriff's Office shows the Eel River in Northern California. They'd been traveling south from OR along Highway 101 when the incident occurred, officials said.
Mid-day April 15, a boating team noticed a gasoline smell emitting from the water approximately a half mile downstream of the reported crash site.
The vehicle was encased in sediment and visibility was poor but divers believed there was at least one body inside, officials said. This provided searchers the ability to conduct a visual inspection of the inside of the vehicle. That evening, at approximately 6:30 p.m., rescuers were able to partially remove the Honda Pilot from the river by using a tow truck.
Soumya Thottapilly's body was found several miles from where the vehicle went into the water.