Cassie Laundrie has spoken out about her brother’s mysterious disappearance, and called on her parents to “come clean” if they are involved.

Cassie, sister to Brian Laundrie, sat down in an exclusive interview with Good Morning America to discuss how Brian’s disappearance following the death of his fiancé Gabby Petito has put their family in a “horrible mess”.

She also spoke about the infamous camping trip to Florida’s Fort De Soto Park, just six days after he returned home form a ‘van life’ trip around the states without Gabby.

“No, I do not know where Brian is — I’d turn him in,” Cassie told Good Morning America.

“I would tell my brother to just come forward and get us out of this horrible mess,” she said of the fugitive who vanished days before 22-year-old Petito was found dead.

“I worry about him. I hope he’s okay — and then I’m angry and don’t know what to think,” she admitted of her 23-year-old brother.

“I’ve tried to get in touch with him — phone went to voicemail,” Ms Laundrie said. “I hope my brother’s alive, because I want answers just as much as everybody else.”

Cassie also implored her parents, Chris and Roberta Laundrie, to come forward with any information, insisting that they have also refused to speak to her ever since she last saw them before Petito was known to be missing.

“I don’t know if my parents are involved,” Ms Laundrie admitted. “I think if they are, then they should come clean.”

“They deserve answers,” she said of the loved ones of Gabby, who she earlier said her children will know as “Aunt Gabby forever.”

Cassie says the last time she saw and spoke to her brother was on September 6th on the notorious camping trip, which has become a key moment in the manhunt for Brian.

The Florida camping trip reportedly happened five days before Gabby was officially reported missing on September 11th.

“We just went for a couple of hours and we ate dinner and had S’mores around the campfire and left,” she recalled. “There was nothing peculiar about it. There was no feeling of grand goodbye — there was no nothing.”

“I’m frustrated that in hindsight I didn’t pick up on anything. It was just the regular visit,” she insisted, saying she immediately told police about it when she realised Petito was missing.

“It was not hidden from law enforcement. I’ve been co-operating with the police since day one,” she said.

Cassie wishes that her brother had come to her when he returned home without Gabby, rather than her parents who initially refused to let law enforcement talk to him.

“I really wish he had come to me first that day with the van, because I don’t think we’d be here,” she said.

Ms Laundrie also said it was “definitely painful” to see the video of her brother fighting with Gabby in Utah during their road trip.

“It was pretty typical them to argue and try and take space from each other. But people saying that they saw public domestic violence — I’ve never seen anything like that from either of them,” she insisted.

You can check out the interview with Cassie Laundrie here:

Image credits: Instagram / Good Morning America

This article first appeared on Over60.