The tragedy has taken a new twist following the shocking car plunge back in March off California Highway 1.
It is believed that Jennifer Hart drove intentionally drove her wife and children off the 100 feet cliff.
The couple's Washington home was searched in the days after the fatal incident.
Investigators reported that they found a 'sterile' home that did not have 'any indication' the six children had been living there.
After the crash authorities found the remains of Jennifer Hart, 28, Sarah Hart, 38, and three of their adopted children Markis Hart, 19, Jeremiah Hart, 14, and Abigail Hart, 14, but the other kids were believed to be missing.
Detective Joe Swenson said: "The house was so orderly and nothing seemed out place regarding any belongings, toys or entertainment items the children may have owned.
"There was very little to show the children had access to any toys or items or entertainment, save for some board games found in the downstairs living room.
"There were also empty picture frames hanging on the walls."
"None of the rooms were personalized for the children or showed the supporting elements that children lived in the residence," Detective Lindsay Schultz said.
"I did not get any indication that children lived in the house," Swenson added.
Investigators also noted that the kitchen and refrigerator were stocked with newly purchased perishable items and empty luggage was left at the house.
This led them to believe that the family's tragic road trip was unplanned.
The couple is thought to have fled their home the same day a case-worker visited them over abuse claims.
While it has emerged that authorities were beginning an investigation into the couple over allegations that they starved and whipped their children.
An intake report from Washington State's Department of Social and Health Services filed March 23 paints a picture of horrific abuse leading up to the fatal crash.
Neighbors claimed the kids often asked them for food while the couple whipped them with belts.
At least four reports of suspected child abuse in the Hart family were made during the past seven years while Sarah Hart pleaded guilty in 2011 to a domestic assault charge in Minnesota over what she said was a spanking given to one of her children.
Before the fatal crash neither of the women were wearing seat belts before they plunged off the rocky coastline.
The body of Ciera Hart, 12, was discovered by authorities.
However, the bodies of 16-year-old Hannah and 15-year-old Devonte have not been found yet.
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