The father of Kienan Hebert says the criminal justice system failed his family by freeing Randall Hopley, the convicted sex offender police say snatched his toddler.

Hopley, who has a lengthy criminal record and a sex assault conviction, has eluded police since the three-year-old boy was discovered missing from his home in southeastern B.C. on Wednesday last week.

The boy was found alone in the home at 3 a.m. Sunday after police received a 911 call saying the child was there.

Speaking to reporters the day after his son was returned unharmed to the family home, Paul Hebert described the joy he felt finding his young child in his living room.

"How many have people have felt (what it's like) to win the lotto? That wouldn't even compare. Finding Kienan sleeping was a meltdown. I felt every piece of my body just go numb and I lost control," he said.

Hebert said Kienan has been enjoying playing with his seven siblings, but believes his family has been deeply affected by the incident, which he says has caused him to second-guess their safety.

"There's definitely a trauma in the home like we've been invaded. Bedtime is a lot harder because the kids saw their brother getting snatched out of the house. As for us as the parents… How far do we go to make our house even safer?"

Hebert said Kienan has moments where he seems insecure, and that he's "taken strange" to new people since he's been back.

"We're hoping it was like a road trip for him for four days and he was with some strangers. And from the looks of it he was well taken care of," he said.

The family will seek professional help for their son, he added.

Hebert praised the police for their hard work in the case, and said it's the justice system that sent Hopley back into the community without proper treatment.

"Hopley was taken in because he had a problem and he had a record having a problem. Now Hopley is out for a reason. Because someone didn't do their job right, and it was not the police," Hebert said.

"The judges and the system failed us. Hopley needs help and the system didn't give him the help he needed and because of that, we have been affected. Our rights have been taken away and our family got hurt."

At least one door in the Hebert home was unlocked the night of Kienan's disappearance. Hebert describes his family as very safety conscious, with he and his wife even taking their children out of public school as a protective measure.

"We home school our children. We've lived here since November, and maybe there's a handful of people who have been in our kitchen. No strangers are in our home. Our windows are open because it's hot and the doors are locked when everyone remembers to lock them," he said.

The Hebert family believes Hopley will turn himself in.

"I think he's a good man that way. He got something that told him to do the right thing. And I think, and I believe, he's going to do the right thing. He's just scared right now," Paul Hebert said.

Police are staying tight-lipped about the progress of the investigation, and have kept mum about how someone could break into the family home twice without being detected.

On Monday, RCMP Cpl. Dan Moskaluk refused to say whether the Hebert home was under 24-hour surveillance when Kienan was brought back.

"We cannot discuss any of the details at this point about how things unfolded. All we can state, again, is our number one priority is his safe return and that was achieved," he told CTV News Channel.

"We have a child who was abducted for four days who was returned safely. We carry on with our investigation at this time and we still need the support of the media and public's patience and support as to getting through this ordeal in Sparwood."

The search and rescue command centre outside the home has now been turned into an RCMP muster point. Dozens of officers converged on the area Monday morning to commence a massive search on the ground, in the bush, on ATVs and in the air.

Police say it is possible Hopley may have switched vehicles but they are still searching for his 1987 Toyota Camry.

Police have ended roadblocks in the town of Sparwood, and are no longer stopping vehicles entering or leaving town.