Christopher Watts, who pleaded guilty two weeks ago, did not speak during the hearing. One of his attorneys said Watts was "sincerely sorry."
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As Watts listened with his head down, Shanann Watts' parents detailed their ongoing struggle to understand how he could murder the three people who considered him a hero - Shanann, 34, Bella, 4, and Celeste, 3. Frank Rzucek said he was disgusted by the way his son-in-law took his wife and two daughters "out like the trash" and dubbed him an "evil monster."
"Prison is too good for you," Rzucek said in a tearful statement directed at Watts. "This is hard to say, but may God have mercy on your soul."
"You disgust me," Rzucek said. "Life will never be the same without Shanann."
He called Watts an "evil monster."
Shanann Watts' father speaks at sentencing
"We loved you like a son," her mother, Sandra Rzucek, said. "We trusted you. Your faithful wife trusted you. Your children adored you and they also trusted you. Your daughter Bella Marie sang a song proudly. I don't know if you got to see it but it was 'Daddy, you're my hero.' I have no idea who gave you the right to take their lives. But I know God and his mighty angels were there at that moment to bring them home to paradise."
Shanann Watts' mother speaks at sentencing
"Why? Why would you do this? You don't deserve to be called a man," Shanann's brother Frankie Rzucek said in a statement read by an attorney. "What kind of person slaughters the people who love him the most? Did you really think you'd get away with this? Did you really think that this was your best option - to throw away your family like they were garbage? They deserve better, and you know it. I hope you spend the rest of your life staring at the ceiling, every night, being haunted by what you've done."
"His motive was simple, your honor," the prosecutor told the court. "He had a desire for a fresh start and to begin a relationship with a new love that overpowered all decency and feelings for his wife and daughters and unborn son."
Prosecutors have said Shanann Watts' relatives, who live in North Carolina, asked them not to seek the death penalty when defense attorneys made the proposal.
Watts, 33, was formally sentenced to three consecutive life sentences for the murders. He also received a 48-year sentence for unlawful termination of a pregnancy and 12 years each for tampering with a corpse, totaling 84 years.
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The girls' bodies were found submerged in separate oil tanks on property owned by the company Watts worked for. His wife's body was found in a shallow grave nearby.
As a prosecutor detailed the injuries found on the bodies, Rzucek leaned forward, gasping. District Attorney Michael Rourke said Shanann Watts was strangled, but her lack of significant injuries suggested her death came slowly.
The girls were smothered, and Rourke said there were signs Bella "fought for her life." Celeste had no visible injuries, he said.
Christopher Watts' parents, Cindy and Ronnie Watts, were permitted to speak as the girls' grandparents.
"We love you," Cindy Watts said into a microphone before turning to look directly at her son. "And we forgive you, son."
Watts wiped away a tear with his shirt after his parents left the podium. He kept his head down for much of the hearing, speaking only once to confirm that he did not want to make a statement before Judge Marcelo Kopcow imposed his sentence.
Friends of Shanann Watts lined up inside the courthouse Monday morning. More people filed into an overflow room to watch a video stream.
The killings became the focus of true crime blogs and online video channels, which showed dozens of family photos and videos that Shanann Watts shared on social media showing the smiling family.
Prosecutors said the images belied a hidden truth, that Christopher Watts was having an affair with a co-worker.
A friend asked police to check on Shanann Watts on Aug. 13 after not being able to reach her and growing concerned that the expectant mother had missed a doctor's appointment.
Rourke said police later found that Watts spoke to a real estate agent about selling the family's home and called the girls' school to report that they could not be present when fall classes began.
Investigators quickly became suspicious of him. Meanwhile, Watts spoke to television reporters from the front porch of the family's home in Frederick, a small town on the plains north of Denver where drilling rigs and oil wells surround booming subdivisions.
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He pleaded for his family's safe return, telling reporters their house felt empty without Bella and Celeste watching cartoons or running to greet him at the door.
Within days he was in custody, charged with killing his family.
Rourke said Watts has never discussed a motive for the killings with police, and investigators could find no explanation other than his ongoing affair.
"I can't speak as to why anyone would take the steps that he did ... we couldn't find anything else that was a significant enough motive to annihilate your family," he said.
The Associated Press contributed to this report.
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