In August 2018, Chris Watts, 33, murdered his pregnant wife, Shan’ann, 34, and their two young daughters, 4-year-old Bella and 3-year-old Celeste.

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Shortly following the murders, Watts reported to the authorities that Shan’ann and their children were missing. He then appeared in front of news cameras to plead for their return. Within days, Watts confessed to killing his wife but attempted to blame her for the deaths of their children. By November he had pleaded guilty to murdering all of them.

WATCH Chris Watts: From Grieving Father And Husband To Convicted Of Murdering Pregnant Wife And Two Daughters

He recently gave a five-hour long interview to authorities detailing the events surrounding the murders of his wife and children.

WATCH What Chris Watts’ Latest Confession Allegedly Reveals About Night He Killed Pregnant Wife And Two Daughters

In a Dr. Phil exclusive airing Monday, Dr. Phil sits down with Shan’ann Watts’ parents, Sandy and Frank Rzucek Sr., along with her brother, Frankie.

“Knowing what you now know, what would you say to him?” asks Dr. Phil of the grieving family.

“The same question I’ve had – Why?” responds Frank Sr. adding, “There’s nothing that I can imagine why you would do that to your family. You want another life? Go. Open the door and leave.”

WATCH: ‘I Think The Hardest Part Is Knowing Our Granddaughter Watched Her Sister Die,’ Says Mother-In-Law To Confessed Killer Chris Watts

“He could have just gotten a divorce,” says Sandy. Calling her daughter and granddaughters’ deaths “inhumane” she says, “I think the hardest thing for me right now is the way they died.”

Check here to find out where you can watch Monday’s episode.  

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Shan’ann Watts’ Mother: ‘I Want To Be On A Mission To Hug Every Woman That’s Missed A Child’