Gabby Petito’s parents said in a recent interview that they want answers from Brian Laundrie’s mother and father about their daughter’s mysterious death and disappearance.

Petito’s parents recently spoke on Australia’s “60 Minutes” about their late daughter, who was found dead in Wyoming in September.

Petito and her boyfriend, Brian Laundrie, had been on a road trip across the country. But only Laundrie returned home on Sept. 1 to North Port, Florida, driving Petito’s van. Petito was reported missing on Sept. 11. Her body was found in Wyoming on Sunday, Sept. 19. It was later confirmed she died by strangulation.

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Laundrie was reported missing on Sept. 17. His parents said they had last seen him on Sept. 14. But they later changed their story to say they had last seen him on Sept. 13.

Petito’s mother, Nicole Schmidt, said on Australia’s “60 Minutes” she thinks Laundrie’s parents know more than they’re saying.

“I think silence speaks volumes. I believe they know probably, if not everything, they know most of the information,” Schmidt said. “I would love to just, face to face, ask, ‘Why are you doing this? Just tell me the truth.’”

Authorities have been searching for Laundrie since he went missing. Much of the search has been focused on the 25,000-acre Carlton Reserve in Florida, where Laundrie was known to hike. His whereabouts remain unknown.