The vehicle was found on March 26 and investigators have said they believe the crash was intentional.
The family's SUV was in the driveway but no one answered the front or back door.
The family's demise in late March came just days after child welfare authorities in their home state of Washington opened an inquiry into allegations the children were being abused or neglected, according to police and social services agencies. He wanted them to leave the food in a box by a fence where his parents couldn't see it.
Investigators said none of the people inside the vehicle was wearing a seat belt.
After Sarah Hart pleaded guilty to a misdemeanor charge of domestic assault, she and Jen pulled their children from schools in Minnesota, in favor of homeschooling. "A little girl jumped out of the second story window on the roof and then down to the ground and then ran to my daughter and this is like 2 in the morning, begging them to help her".
Farther south along the Mendocino County coast, authorities proceed to find associates of the Hart household, overlooking past 42, since an SUV left a dip away a towering sea bluff. "The theory is the child is from this vehicle". There was no SUV mention in the case notes, which says the business card from the first call was no longer in the front door.
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Investigators believe the family's other three children, 15-year-old Sierra Hart, 16-year-old Hannah Hart and 15-year-old Devonte Hart were in the SUV at the time of the crash but their bodies have not been recovered.
Officials initially thought the remains were that of a child, but later clarified that it was a woman. The caller was a father of a woman who lived next door to the Harts.
Personal items and parts of a vehicle belonging to a missing Valencia family were found this week in a flooded Northern California river amid a continuing search for bodies, officials announced Thursday.
Mendocino County Sheriff Tom Allman on Friday said toxicology results showed Hart's blood alcohol content was 0.102, above the legal driving limit of 0.08. The bodies of three of their children - Markis, 19, Jeremiah, 14, and Abigail, 14 - were found nearby. Tracks at the top of the cliff indicate the vehicle stopped about 70 from the cliff's edge and accelerated to between 20 miles per hour and 30 miles per hour before plunging over the edge.
Toxicology tests found Jennifer Hart had an alcohol level of 0.102, said California Patrol Capt. Bruce Carpenter.
He noted the Yukon had traveled some 23 metres along an unpaved roadside pullout before running off the cliff, leaving behind no skid or brake marks, indicating the vehicle may have been driven off the cliff intentionally.