Hannah Hart, 16; Devonte Hart, 15; and Sierra Hart, 12, have not been found.
Police have said a search of the family's home in Woodland, Washington, turned up no suicide note.
The five bodies were recovered days after authorities in Washington State began investigating the couple for possible child neglect. That first report indicated that the agency acted because it believed the "living situation is immediately risky or unhealthy".
One of their children, Abigail, told Minnesota authorities in 2010 that Jennifer Hart withheld food from her when she misbehaved, according to a police report.
OR officials would not discuss what child welfare workers learned when they went to check on Markis, Hannah, DeVonte, Jeremiah, Abigail and Sierra after Argyropoulos reported the parents.
Jennifer Hart was drunk when she drove her wife and six adoptive children off a Northern California cliff last month in what is believed to have been an intentional plunge off a scenic Pacific Ocean overlook, authorities said Friday.
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"This tragic story is just one of many that highlight our immediate need for reform", she said.
The neighbor told state investigators that Devonte looked "distorted", and his frame was "tinier than his head", with small shoulders.
The mother of Devonte, Jeremiah and Sierra Hart is taking the news "hard", her husband told KOIN 6 News Thursday night.
The remains of Jennifer and Sarah Margaret Hart, both 38, and three of the children were found in the wreckage of a GMC Yukon after it ran off California Highway 1 and plunged over a steep embankment onto the rocky shoreline below.
The neighbors alerted the parents who came over and got Hannah, but she grew frantic and begged the neighbors to stay.
By the next morning, the Harts had left town.
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After the March 23 visit, investigators went back three days later. She was convicted of misdemeanor domestic assault and received a 90-day suspended jail sentence after the 2011 incident.
But what most alarmed Argyropoulos was that Hart repeatedly withheld meals from the children, who appeared constantly hungry. The bodies may have been swept away by the ocean.
An anatomy identified as African American and female has been discovered floating in the vicinity of the wreck site on April 7.
Efforts to find the three additional Hart children missing are still ongoing.
Sheriff Tom Allman has described the crash as "a crime".
No skid marks were seen in the area, officials said.
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Jennifer Hart had a blood alcohol level of.102 at the time of the crash, California Highway Patrol Capt. Bruce Carpenter said at a press conference Friday.