PORTLAND -- In the weeks following the disappearance of Kyron Horman, both of his parents said they have come to the conclusion that step-mother Terri Moulton Horman was capable of harming the seven-year-old.

When I look in her eyes, I'm not confident that she couldn't do something, Kyron's mother Desiree Young told Kate Snow of NBC's 'Dateline.'

Kyron's father, Kaine Horman said I think anything is possible based on what's gone on in the past few weeks.

Raw video: Parents believe Terri capable of harm

Before that interview, the parents answered a variety of questions from the media and their answers were remarkably candid, especially about Terri's lack of cooperation in the investigation.

I've known her a long time, Desiree said, I know she's lying.

She drove home the point, saying mothers have instincts and unfortunately I had feelings about this when I got the phone call, about Kyron's disappearance from Skyline grade school on June.

Raw video: Desiree describes call from Skyline

When asked whether they thought someone else might be involved in the disappearance, Kaine and Desiree were quiet for a moment, looked at each other, then Kaine said they did not want to speculate.

Kaine said that when he learned of a murder-for-hire plot, I didn't believe it at first.

A restraining order prepared by Kaine and made public Thursday confirmed earlier reports that Terri plotted to have Kaine murdered late last year by a landscaper she had hired.

It wasn't something I could wrap my head around, Kaine told NBC.

But even by the time he learned of the murder conspiracy, Kaine and Desiree had suspicions about Terri. We were at that point before then, Kaine said.

The attempt to hire an accomplice also led Desiree to speculate in the NBCinterview that more than one person was involved in Kyron's disappearance.

Police have not identified Terri Horman as a suspect or person of interest, but Kaine Horman wrote in his restraining order documents that police believe she is involved in Kyron s disappearance.

In the interview, they again expressed hope that Kyron would be coming home. When asked if investigators have provided them information to have confidence that Kyron was alive, Kaine said yes. He declined to provide specifics.

Desiree said she and Kaine both passed polygraph tests with flying colors. Kaine said Terri did not pass either of the two tests she took.

Desiree Young described Terri's behavior and participation is ridiculous at this point. She said Terri is not taking an active role in finding Kyron.

Kaine explained that he asked the court to remove Terri from their home because Kyron deserves to come to his own room, not a safe house somewhere else.

Kaine's parents emphasized that they wanted to keep the focus on finding Kyron and bringing him home.

Kyron's still missing that's what's important, said Kaine. It (the murder-for-hire plot) will be dealt with later in a different venue, right now it's not important.

Meantime, Kaine and Desiree continue to try and get out their message, hoping Kyron sees it.

Don't be afraid, Desiree said to Kyron, We're going to come get you. You're coming home.

I believe God is looking down over Kyron and protecting him, she said.

Complete Coverage: Search for Kyron Horman

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