The news comes as the couple stands accused of starving and imprisoning their children at their California home.
Billy Baldwin and his mother bought the Texas house in April 2011 after a neighbour who worked with his father told them that it was for sale.
Speaking of the condition of the home, Mr Baldwin said that “it was just nasty”.
He added that there was “all kinds of stuff” all over the walls and carpet, the bathroom floor was “totally rotted out,” the roof was leaking, and there were holes in the walls and ceilings.
Mr Baldwin the revealed damage in photos and claimed the family had moved to into a trailer behind the home years after “trashing” it.
After Mr Baldwin bought the home, one of the neighbours reportedly told him that the Turpin family “up and disappeared” after one of their daughters was seen walking up the street.
That daughter allegedly was asking neighbours for a ride and inquiring on how to obtain a driver’s license, he claimed.
Mr Baldwin said: “You don’t just walk away from a place after you’ve been paying on it 10 or 12 years.”
He said he had never met the family and had “no idea” what happened in the home after he bought it.
However, he did claim to have later found a Polaroid photo of one of the bedrooms, which shows a rope tied to the end of a bed rail.
The revelation has come after David Turpin, 57, and Louise Turpin, 49, were both arrested last weekend and each charged with nine counts of torture and 10 counts of child endangerment.
Authorities were made aware of the shocking situation when a 17-year-old girl escaped from the house and called police using a mobile phone.
When officers entered the suburban home they found several of the 13 siblings “shackled to their beds” in “foul-smelling” conditions.
Police chief Captain Gregg Fellows said the children had suffered “torture” at the hands of their parents.
He said: “If you can imagine being 17 years old and appearing to be a 10 year old, being chained to a bed and being malnourished and injuries associated with that, I would call that torture.”
California Police said: “Deputies located what they believed to be 12 children inside the house, but were shocked to discover that seven of them were actually adults.
“Further investigation revealed several children shackled to their beds with chains and padlocks in dark and foul-smelling surroundings, but the parents were unable to immediately provide a logical reason why their children were restrained in that manner.”
The children range in age from two to 29. Six of the children are minors, including the 17-year-old girl, who police initially believed to be aged 10.