The sister of Gabby Petito's fiancé insists her family wants to find the missing woman safe after breaking her silence on the disappearance.

In a new interview Cassie Laundrie said the missing woman is "like a sister" and she hopes the case will turn out to be just "a big misunderstanding".

Gabby Petito, from New York, has not been seen since she left a hotel with her boyfriend Brian Laundrie, in Salt Lake City, Utah, in the US, on August 24.

She had been making a social media blog as she travelled around the United States with her fiancé before her disappearance.

Brian Laundrie, 23, returned to their home in North Port, Florida, on September 1 without Gabby, who has not been seen or heard from.

Gabby Petito was reported missing by her family on Saturday (



His sister Cassie appeared for an interview on ABC's Good Morning America on Thursday.

In a brief clip which was aired ahead of the full Friday show, she said: "Obviously me and my family want Gabby to be found safe.

"She's like a sister and my children love her.

"And all I want is for her to come home safe and found and this to be just a big misunderstanding."

Her full interview will be aired on Friday morning.

Bodycam footage recently released showed her distraught a month before she was reported missing (


Moab City Police Department)

It comes after the family of the missing woman begged her partner's parents for help and said their "lives are falling apart".

In the letter addressed to Brian Laundrie's parents shared on social media the missing woman's family begged him to give more details about her disappearance.

Authorities have attempted to speak with him and his parents, but they have so far refused to cooperate.

Earlier this week Laundrie broke his silence for the first time on Tuesday, releasing a statement through his legal team.

She had been documenting her travels on social media (



Through his lawyer he said he "understands a search has been organised in Wyoming" and called the disappearance an "extremely difficult time" for the family.

Gabby was reported missing by her mum Nichole Schmidt last Saturday and an investigation was started by Suffolk County Police Department.

She and her partner had been sharing their trip, which began on July 2, on social media and were building up a following under the name “Nomadic Statik”.

The missing woman is described as 5ft 5in, with several tattoos, including one on her forearm reading “let it be”.

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