The ex-brother-in-law of a man who vanished with his family last month has admitted to killing the family of four over an inheritance dispute.

According to the BBC, Pascal Troadec’s former brother-in-law, known as Hubert C, told French authorities that he killed all four members of the Troadec family in their home. He is believed to have bludgeoned them to death with a blunt object, according to Le Parisien.

Mr. C and his ex-wife, Pascal Troadec’s sister, were taken into custody on Sunday after items belonging to the Troadec family were discovered near the sister’s home in Brest. At the time, authorities reportedly believed some members of the Troadec family may still be alive.

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The source of the dispute is believed to be gold bars discovered at a building the Troadec brothers’ late father owned. But according to the BBC, Hubert C’s mother has told reporters the existence of the gold bars is a “myth.”

It is not known yet if the suspect has told police where the bodies are, or what Mr. Troadec’s sister’s role was in the crime.

READ also: ‘Frozen in Time’: Family’s sudden disappearance echoes notorious murder mystery

The Troadec family – Pascal and Brigitte, 49; Sebastian, 21; and Charlotte, 18; vanished in mid-February from their home outside of Nantes in western France. Hairbrushes and toothbrushes were missing from the home, and the beds were stripped. Blood traces and evidence of attempts to wipe blood away were found on some personal items, including Sebastian’s phone and Brigitte’s watch.

Last week, police found Sebastian’s in an area between Nantes and Brest; and an item of clothing a social security card belonging to Caroline were found in a wooded area in Brest, near Pascal’s sister’s home.