Gabby Petito’s family is fighting back hard against Brian Laundrie’s parents.

Joe Petito and Nichole Schmidt have amended their March lawsuit against Chris and Roberta Laundrie.

Brian’s parents filed a motion to dismiss the original Petito-Schmidt lawsuit.

In a brand report from WFLA, Gabby’s parents filed an amended lawsuit.

The amended suit claims Chris and Roberta went on vacation with Brian while knowing he had murdered Gabby.

The new lawsuit also claims the Laundries refused to disclose the location of her remains.

They knew all along Brian murdered his 22-year-old girlfriend.

The Laundries looked into ways to help him flee the country.

Brian Laundrie admitted to killing Gabby Petito in a notebook entry.