Convicted killer Chris Watts has given Colorado authorities additional details about the events surrounding the August 2018 murders of his 34-year-old pregnant wife, Shan’ann, and their daughters, 4-year-old Bella and 3-year-old Celeste.

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Watts’ so-called “jailhouse confession” comes seven months after he executed his family and four months after he pleaded guilty to killing them.

WATCH ‘Chris Watts Is What We Call A Family Annihilator,’ Says Former FBI Criminal Profiler

“I think the hardest part is knowing our granddaughter watched her sister die and then begged for her life,” says Shan’ann’s mother, Sandy Rzucek, reacting to what the family has been told about her son-in-law’s description of the last words spoken to him by Bella.

WATCH: What Chris Watts’ 4-Year-Old Allegedly Said To Him Before He Killed Her

Sandy, her husband, Frank Sr., and their son, Frankie, say they haven’t yet listened to audio from the five-hour interview that Watts gave to authorities - but they plan to.

Watch the video above to learn what the family says about the Chris Watts they say they thought they knew.

Plus, find out why Sandy says she’s “grateful to God he spoke.”

WATCH: Life-After-Death: Did Spirits Of Shan’ann Watts And Her Daughters Visit Mom After Their Murders?

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Father Of Murder Victim Shan’ann Watts Reveals What He’d Say To Son-In-Law, Chris, If Given The Chance